Jozsef (Joe) Szilagyi

Jozsef (Joe) Szilagyi

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Title Research Hydrologist
Address 625 South Hardin Hall
3310 Holdrege Street
Lincoln NE
Phone 402-472-9667
FAX 402-472-2946
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Joe Szilagyi is a research hydrologist and professor in the School of Natural Resources. He is associated with SNR's water faculty and has been at UNL since 1997.

His main research interests include the interaction of surface water and groundwater, hydrological forecasting, regional-to-continental-scale analysis of the hydrologic cycle, and the effect of climate change on it. One of his current research projects involves estimating watershed-to-continental-scale evapotranspiration (ET) by standard meteorological measurements and 1-km resolution Moderate Resolution Imaging Spectroradiometer (MODIS) daytime land surface temperature data. Recent research involving estimating riparian ET from diurnal changes in the stream-flow rate and in the groundwater level are important to the state and nation. His work helps citizens, agricultural producers and decision makers understand how groundwater and surface water communicate with each other, and how ET is distributed in space over the watershed, which helps in local and catchment-scale water management tasks and irrigation-impact studies.

He also has an example of his work in regional ET estimation with CREMAP in this website site's data section.

Drought Year (2002)

The distribution of ET over the Elkhorn watershed in a drought (2002) year.

Wet Year (2007)

The distribution of ET over the Elkhorn watershed in a wet (2007) year.

The distribution of ET over the Elkhorn watershed in a drought (2002) and in a wet (2007) year. Note how the rangelands of the Sand Hills in the western part of the watershed become much drier in a drought year than the rest, mostly irrigated soybean and corn, of the catchment. Click on images to enlarge.

Selected Publications

Ma, N., Szilagyi, J., Zhang, Y., Liu, W., 2019. Complementary-relationship-based modeling of terrestrial evapotranspiration across China during 1982-2012: Validations and spatiotemporal analyses, Journal of Geophysical Research-Atmospheres, 124, doi: 2018JD029850.
Szilagyi, J., Crago, R., 2019. Comment on "Derivation of a sigmoid generalized complementary function for evaporation with physical constraints"¯ by S. Han and F. Tian, Water Resources Research, in press. Online
Zagyvai-Kiss, K., Kalicz, P., Szilagyi, J., Gribovszki, Z., 2019. On the specific water holding capacity of litter for three forest ecosystems in the eastern foothills of the Alps, Agricultural and Forest Meteorology, 278,
Szilagyi, J., 2018. A calibration-free, robust estimation of monthly land surface evapotranspiration rates for continental-scale hydrology, Hydrology Research, 49, doi:10.2166/nh.2017.078. Online
Szilagyi, J., 2018. Anthropogenic hydrological cycle disturbance at a regional scale: state-wide evapotranspiration trends (1979-2015) across Nebraska, USA, Journal of Hydrology, 557, 600-612, doi:10.1016/j.jhydrol. 2017.12.062. Online
Szilagyi, J., 2018. County-wide Assessment of Irrigation Expansion on Air Temperature, Humidity and Evapotranspiration Rates in Nebraska, 1979-2015. University of Nebraska-Lincoln, Conservation and Survey Division, Bulletin 10 (New Series), 24 p. Online
Szilagyi, J., Jozsa, J., 2018. Evapotranspiration Trends (1979-2015) in the Central Valley of California, USA: Contrasting Tendencies During 1981-2007, Water Resources Research, doi: 10.1029/2018WR022704. Online
Crago, R., Qualls, R., Szilagyi, J., Huntington, J., 2017. Reply to comment by Ma and Zhang on 'Rescaling the complementary relationship for land surface evaporation'. Water Resources Research, 53, 2. Online
Szilagyi, J. 2017. Basic Meteorological Data Derived 30-year Normas (1981-2010) of Actual Evapotranspiration Rates in Nebraska, USA. Conservation and Survey Division, University of Nebraska. pp. 16. Online
Szilagyi, J., 2017. On the Clark Unit Hydrograph Model of HEC-HMS. Periodica Polytechnica Civil Engineering, 62(1), 277-279. Online
Szilagyi, J., Crago, R., Qualls, R. J., 2017. A calibration-free formulation of the complementary relationship of evaporation for continental-scale hydrology, Journal of Geophysical Research-Atmospheres, 122, doi:10.1002/2016JD025611. Online
Crago, R., Szilagyi, J., Qualls, R. J., Huntington, J., 2016. Rescaling of the complementary relationship for land surface evaporation, Water Resources Research, doi:10.1002/2016WR019753. Online
Ma, N., Szilagyi, J., Niu, G.-Y., Zhang, Y., Zhang, T., Wang, B., Wu, Y. 2016. Evaporation variability of Nam Co Lake in the Tibetan Plateau and its role in recent rapid lake expansion. Journal of Hydrology. 537:27-35. Online
Szilagyi, J. 2016. Recent trends in land surface evapotranspiration across the contiguous United States. Journal of Hydrology and Environment Research, 4, 33-40. Online
Szilagyi, J., Crago, R., Qualls, R. 2016. Testing the generalized complementary relationship of evaporation with continental-scale long-term water-balance data. Journal of Hydrology, 540:914-922. Online
Wang, T., Franz, T., Yue, W., Szilagyi, J., Zlotnik, V., You, J., Shulski, M., Young, A. 2016. Feasibility analysis of using inverse modeling for estimating natural groundwater recharge from a large-scale soil moisture monitoring network. Journal of Hydrology. 533: 250-265. Online
Kramer, T., Szilagyi, J., Jozsa, J., 2015. Revision of nationwide design flood levels (in Hungarian), Mernok Ujsag 22(1-2), 22-25. Online
Ma, N., Zhang, Y., Szilagyi, J., Guo, Y., Zhai, J., Gao, H., 2015. Evaluating the complementary relationship of evapotranspiration in the alpine steppe of the Tibetan Plateau, Water Resources Research. 51: 1069-1083. Online
Ma, N., Zhang, Y., Xu, C-Y., Szilagyi, J., 2015. Modeling actual evapotranspiration with routine meteorological variables in the data scarce region of the Tibetan Plateau: comparisons and implications, Journal of Geophysical Research Biogeosciences, 120, 1-20, Online
Szilagyi, J. 2015. Complementary-relationship-based 30 year normals (1981-2010) of monthly latent heat fluxes across the contiguous United States. Water Resources Research, 51, 9367- 9377, doi:10.1002/2015WR017693. Online
Szilagyi, J., 2015. Comment on 'Revised coefficients for Priestley-Taylor and Makkink-Hansen equations for estimating daily reference evapotranspiration' by N.C. Cristea, S.K. Kampf, and S. J. Burges, published in Journal of Hydrologic Engineering, 18(10), 1289-1300. Journal of Hydrology and Environment Research, 3(1), 67-70. Online
Szilagyi, J., 2015. Complementary-relationship-based 30-year normals (1981-2010) of monthly latent heat fluxes across the contiguous United States, Water Resources Research, 51: 9367-9377. Online
Szilagyi, J., 2015. Water balance validation of a temperature dependent parameter value of the Priestley-Taylor equation of evapotranspiration. Journal of Hydrology and Environment Research, 3(1), 1-5. Online
Gates, J. B., Steele, G. V., Nasta, P., Szilagyi, J., 2014. Lithologic influences on groundwater recharge through incised glacial till from profile to regional scales: Evidence from glaciated Nebraska, Water Resources Research, 50, 1-16,
Rossman, N. R., Zlotnik, V. A., Rowe, C. M., Szilagyi, J., 2014. Vadose zone lag time and potential 21st century climate change effects on spatially distributed groundwater recharge rates in the semi-arid Nebraska Sand Hills, Journal of Hydrology, 519, 656-669. Online
Szilagyi, J., 2014. MODIS-aided water-balance investigations in the Republican River basin, USA. Periodica Polytechnica-Civil Engineering, 58(1), 33-46. Online
Szilagyi, J., 2014. Temperature corrections in the Priestley-Taylor equation of evaporation, Journal of Hydrology, 519, 455-464. Online
Szilagyi, J., 2014. Testing the rationale behind an assumed linear relationship between evapotranspiration and land surface temperature. Journal of Hydrologic Engineering. 20. Online
Szilagyi, J., Laurinyecz, P., 2014. Accounting for back-water effects in flow routing by the Discrete Linear Cascade Model. Journal of Hydrologic Engineering, 19(1), 69-77. Online
Szilagyi, J., Parlange, M. B., Katul, G. G., 2014. Assessment of the Priestley-Taylor parameter value from ERA-Interim global reanalysis data. Journal of Hydrology and Environment Research, 2(1), 1-7. Online
Szilagyi, J., Schepers, A., 2014. Coupled heat and vapor transport: the thermostat effect of a freely evaporating land surface, Geophysical Research Letters, 41(2), 435-441. Online
Gribovszki, Z., Kalicz, P., Szilagyi, J., 2013. Does the accuracy of fine-scale water level measurements by vented pressure transducers permit for evapotranspiration estimation? Journal of Hydrology, 488, 166-169. Online
McMahon, T., Peel, M., Szilagyi, J., 2013. Comment on the application of the Szilagyi-Jozsa advection-aridity model for estimating actual terrestrial evapotranspiration in 'Estimating actual, potential, reference crop and pan evaporation using standard meteorological data: a pragmatic synthesis' by McMahon et al. (2013). Hydrology and Earth System Sciences, 17, 4865-4867. Online
Szilagyi J., Jozsa, J. 2013. MODIS-aided statewide net groundwater-recharge estimation in Nebraska, Ground Water, 51(5), 735-744, Online
Szilagyi J., Zlotnik, V., Jozsa, J. 2013. Net recharge versus depth to groundwater relationship in the Platte River Valley of Nebraska, USA, Ground Water, 51(6), 945-951 Online
Szilagyi, J., 2013. Application of MODIS-based evapotranspiration rates in runoff modeling: a case study in Nebraska, USA. Open Journal of Modern Hydrology, 3, 172-178. Online
Szilagyi, J., 2013. Recent updates of the Calibration-Free Evapotranspiration Mapping (CREMAP) method, in Alexandris, S. & Sticevic, R. (eds.) Evapotranspiration: An Overview, INTECH, Rijeka, Croatia, ISBN 980-953-307-541-4, Online
Szilagyi, J., 2012. Comment on 'Assessing interannual variability of evapotranspiration at the catchment scale using satellite-based evapotranspiration data sets' by Cheng et al. Water Resources Research, 48. Online
Szilagyi, J., Kovacs, A., Jozsa, J., 2012. Estimation of spatially distributed mean annual recharge rates in the Danube-Tisza interfluvial region of Hungary. Journal of Hydrology and Hydromechanics, 60, 64-72. Online
Gribovszki, Z., Kalicz, P., Szilagyi, J., 2011. Numerical validation of a diurnal streamflow-pattern based evapotranspiration estimation method, Acta Silvatica et Lignaria Hungarica, 7, 63-74. Online
Huntington, J., Szilagyi, J., Tyler, S., Pohll, G., 2011. Evaluating the Complementary Relationship for estimating evapotranspiration from arid shrublands, Water Resources Research, 47. Online
Szilagyi, J., Gribovszki, Z., Kalicz, P., 2011. Comment on Interference of river level changes on riparian zone evapotranspiration estimates from diurnal groundwater level fluctuation¯ by Zhu et al., Journal of Hydrology, 409, 578-579. Online
Szilagyi, J., Kovacs, A., Jozsa, J., 2011. A calibration-free evapotranspiration mapping (CREMAP) technique, in Labedzki, L (ed.) Evapotranspiration, INTECH, Rijeka, Croatia, ISBN 978-953-307-251-7, Online
Szilagyi, J., Zlotnik, V., Gates, J., Jozsa, J., 2011. Mapping mean annual groundwater recharge in the Nebraska Sand Hills, USA, Hydrogeology Journal, 19(8), 1503-1513, doi: 10.1007/s10040-011-0769-3. Online
Szilagyi, J.,Kovacs, A., 2011. A calibration-free evapotranspiration mapping technique for spatially-distributed regional-scale hydrologic modeling, Journal of Hydrology and Hydromechanics, 59(2), 118-130. Online
Gribovszki, Z., Szilagyi, J.,Kalicz, P., 2010. Diurnal fluctuations in shallow groundwater levels and in streamflow rates and their interpretation ā€“ A review, Journal of Hydrology, 385, 371-383. Online
Szilagyi, J., 2010. Discussion of "Estimation of the water balance using observed soil water in the Nebraska Sandhills" by Sridhar, V. and Hubbard, K. G., Journal of Hydrologic Engineering, 15(12), 1075. Online
Szilagyi, J., Kovacs, A., 2010. Complementary-relationship-based evapotranspiration mapping (CREMAP) technique for Hungary, Periodica Polytechnica Civil Engineering, 54(2), 95-100. Online
Szilagyi, J., Szollosi-Nagy, A., 2010. Recursive Streamflow Forecasting: A State-Space Approach, Taylor & Francis, pp. 212, ISBN-13: 978-0-415-56901-9. Online
Szilagyi, J., 2009. Comment on "Power-law catchment-scale recessions arising from heterogeneous linear small-scale dynamics" by Harman, C. J., Sivapalan, M., and Kumar, P., Water Resources Research, 45, W12601, doi:10.1029/2009WR008321. Online
Szilagyi, J., Hobbins, M., Jozsa, J., 2009. A modified Advection-Aridity model of evapotranspiration, Journal of Hydrologic Engineering, 14(6), 569-574. Online
Szilagyi, J., Jozsa, J., 2009. An evaporation estimation method based on the 2-D turbulent heat and vapor transport equations, Journal of Geophysical Research-Atmospheres, 114: D06101, doi:10.1029/2008JD010772. Online
Szilagyi, J., Jozsa, J., 2009. Complementary relationship of evaporation and the mean annual water-energy balance, Water Resources Research, 45, W09201, doi:10.1029/2009WR008129. Online
Szilagyi, J., Jozsa, J., 2009. Estimating spatially distributed monthly evapotranspiration rates by linear transformations of MODIS daytime land surface temperature data, Hydrology and Earth System Sciences, 13(5), 629-637. Online
Szilagyi, J.,Jozsa, J., 2009. Analytical solution of the coupled 2-D turbulent heat and vapor transport equations and the complementary relationship of evaporation, Journal of Hydrology, 372, 61-67. Online
Gribovszki, Z., Kalicz, P., Kucsara, M., Szilagyi, J., Vig, P., 2008. Evapotranspiration calculation on the basis of the riparian zone water balance, Acta Silvatica et Lignaria Hungarica, 4, 95-106. Online
Gribovszki, Z., Kalicz, P., Szilagyi, J., Kucsara, M., 2008. Riparian zone evapotranspiration from diurnal groundwater-level fluctuations, Journal of Hydrology, 349(1-2): 6-17. Online
Szilagyi, J., 2008. Comment on "Comparison of 15 evaporation models applied to a small mountain lake in the northeastern USA"¯ by D. O. Rosenberry, T. C. Winter, D. C. Buso, and G. E. Likens, Journal of Hydrology 348(3-4): 564-565. Online
Szilagyi, J., Gribovszki, Z., Kalicz, P., Kucsara, M., 2008. On diurnal riparian zone groundwater-level and streamflow fluctuations, Journal of Hydrology, 349(1-2): 1-5. Online
Szilagyi, J., Jozsa, J., 2008. New findings about the Complementary Relationship-based evaporation estimation methods, Journal of Hydrology, 354: 171-186. Online
Szilagyi, J., Pinter, N., Venczel, R., 2008. Application of a routing model for detecting channel flow changes with minimal data, Journal of Hydrologic Engineering, 13(6): 521-526. Online
Szilagyi, J., 2007. Analysis of the nonlinearity in the runoff response to precipitation through numerical modeling, Journal of Hydrology, 337, 391-401. Online
Szilagyi, J., 2007. Hungarian national report on IAHS: 2003-2006, Acta Geodaetica et Geophysica Hungarica, 42(2): 227-233. Online
Szilagyi, J., 2007. On the inherent asymmetric nature of the complementary relationship of evaporation, Geophysical Research Letters, 34, L02405. Online
Szilagyi, J., Gribovszki, Z., and Kalicz, P., 2007. Estimation of catchment-scale evapotranspiration from baseflow recession data: Numerical model and practical application results, Journal of Hydrology, 336, 206-217. Online
Szilagyi, J., 2006. Comment on "Evaluation of the impact of groundwater irrigation on streamflow in Nebraska"¯ by F. Wen and X. Chen, Journal of Hydrology, 331: 605. Online
Szilagyi, J., 2006. Comment on "Using numerical modelling to evaluate the capillary fringe groundwater ridging hypothesis of streamflow generation"¯ by H. L. Cloke, M. G. Anderson, J. J. McDonnell, and J. P. Renaud, Journal of Hydrology, 329: 724-729. Online
Szilagyi, J., 2006. Discrete state-space approximation of the continuous Kalinin-Milyukov-Nash Cascade of noninteger storage elements, Journal of Hydrology, 328: 132-140. Online
Szilagyi, J., Balint, G., Csik, A., Gauzer, B., Horoszne-Gulyas, M., 2006. Simulation of the superimposition of floods in the Upper Tisza Region, in "Transboundary Floods: Reducing Risks through Flood Management", Marsalek, J., Stancalie, G., and Balint, G. (Eds.), NATO Science Series, IV. Earth and Environmental Sciences 72, Springer, Dordrecht, Netherlands. Online
Szilagyi, J., Balint, G.,Csik, A., 2006. A hybrid, Markov chain-based model for daily streamflow generation at multiple catchment sites, Journal of Hydrologic Engineering, 11(3): 245-256. Online
Szilagyi, J., Parlange, M. B., and Balint, G., 2006. Assessing stream-aquifer interactions through inverse modeling of flow routing, Journal of Hydrology, 327: 208-218. Online
Jozsef, S., H.F. Edwin, and J.F. Ayers. 2005. Regional Estimation of Total Recharge to Ground Water in Nebraska. Ground Water, 43(1):63-69. Online
Szilagyi, J., Balint, G., Gauzer, B., and Bartha, P., 2005. Flow routing with unknown rating curves using a state-space reservoir-cascade-type formulation, Journal of Hydrology, 311: 219-229. Online
Szilagyi, J., 2004. Accounting for stream-aquifer interactions in the state-space discretization of the KMN-cascade for streamflow forecasting, Journal of Hydrologic Engineering, 9(2): 135-143. Online
Szilagyi, J., 2004. Comment on "A reappraisal of the Kalman filtering technique as applied in river flow forecasting by M. Ahsan and K. M. O'Connor"¯, Journal of Hydrology, 285: 286-289. Online
Szilagyi, J., 2004. Heuristic continuous baseflow separation, Journal of Hydrologic Engineering, 9(4): 1-8. Online
Szilagyi, J., 2004. Vadose zone influences on aquifer parameter estimates of saturated-zone hydraulic theory, Journal of Hydrology, 286: 78-86. Online
Szilagyi, J., 2003. Sensitivity analysis of aquifer parameter estimations based on the Laplace-equation with linearized boundary conditions, Water Resources Research, 39(6): art.# 1156. Online
Szilagyi, J., 2003. State-space discretization of the KMN-cascade in a sample-data system framework for streamflow forecasting, Journal of Hydrologic Engineering, 8(6): 339-347. Online
Szilagyi, J., Harvey, F. E., Ayers, J. F., 2003. Regional Estimation of Base Recharge to Ground Water Using Water Balance and a Base-flow Index. Ground Water 41:504-513. Online
Szilagyi, J. 2002. Comment on "The hydrology and hydrometeorology of extreme floods in the Great Plains of Eastern Nebraska" by Y. Zhang, J.A. Smith, and M.L. Baeck. Advances in Water Resources. 25(6):701-702.
Szilagyi, J. 2002. Vegetation indices to aid areal evapotranspiration estimations. Journal of Hydrologic Engineering. 7(5):368-372. Online
Szilagyi, J., Parlange, M.B., Pats, J.A., Graczyk, T.K. 2002. Sensitivity of watershed runoff under humid conditions to potential climate variations. Journal of Environmental Engineering. 128(7):635-642.
Parlange, J.Y., Stagnitti, F., Heilig, A., Szilagyi, J., Parlange, M.B., Steenhuis, T. S., Hogarth, W.L., Barry, D.A., Li, L. 2001. Sudden drawdown and drainage of a horizontal aquifer. Water Resources Research. 37(8):2097-2101. Online
Summerside, S.E. Ponte, M., Dreeszen, V.H., Hartung, S.L., Khisty, M.J., Szilagyi, J. 2001 Update and Revision of Regional 1x2 Degree Water-Table Configuration Maps for the State of Nebraska. Conservation & Survey Division, University of Nebraska - Lincoln
Summerside, S.E., Szilagyi, J. 2001. Configuration of Water Table, Circa 1995 (Valentine). Map. [1:250,000]. Configuration of Water Table, Circa 1995 Series. Lincoln: Conservation and Survey Division, University of Nebraska. Print.
Szilagyi, J. 2001. Identifying the cause of declining flows in the Republican River, USA. Journal of Water Resources Planning and Management. 127(4):244-253. Online
Szilagyi, J. 2001. Modeled areal evaporation trends over the conterminous United States. Journal of Irrigation and Drainage Engineering. 127(4):196-200.
Szilagyi, J. 2001. On Bouchet's complementary hypothesis. Journal of Hydrology. 146:155-158. Online
Szilagyi, J., Katul, G.G., Parlange, M.B. 2001. Evapotranspiration intensifies over the conterminous United States. Journal of Water Resources Planning and Management. 127(6):354-362. Online
Szilagyi, J. 2000. Can a vegetation index be indicative of areal transpiration? Ecological Modeling. 127:65-79.
Szilagyi, J. 1999. On the Use of Semi-Logarithmic Plots for Baseflow Separation. Ground Water 37(5):3. Online
Szilagyi, J., M. B. Parlange, G. G. Katul, and J. D. Albertson, 1999. An objective method for determining principal time scales of coherent eddy structures using orthonormal wavelets, Advances in Water Resources, 22(6): 561-566. Online
Szilagyi, J., M.B. Parlange 1999. A Geomorphology-based Semi-distributed Watershed Model. Advances in Water Resources 23(0):9. Online
Szilagyi, J., M.B. Parlange 1999. Defining Watershed-scale Evaporation Using a Normalized Difference Vegetation Index. Journal of the American Water Resources Association 35(5):11. Online
Szilagyi, J.,1999. Streamflow depletion investigations in the Republican River basin: Colorado, Nebraska, and Kansas, Journal of Environmental Systems, 27(3): 251-263. Online
Szilagyi, J., D.C. Rundquist, D.C, Gosselin, and Parlange, M.B. 1998. NDVI Relationship to Monthly Evaporation. Geophysical Research Letters 25(10):1753-1756. Online
Szilagyi, J., M.B. Parlange, J.D. Albertson. 1998. Recession Flow Analysis for Aquifer Parameter Determination. Water Resources Research 34(7):7. Online
Szilagyi, J., M.B. Parlange. 1998. Baseflow Separation Based on Analytical Solutions of the Boussinesq Equation. Journal of Hydrology 204:10. Online
Szilagyi, J. and C. J. Vorosmarty, 1997. Water-balance modeling in a changing environment: reductions in unconfined aquifer levels in the area between the Danube and Tisza rivers in Hungary, Journal of Hydrology and Hydromechanics, 45: 348-364. Online
Szilagyi, J., G. G. Katul, M. B. Parlange, J. D. Albertson and A. T. Cahill, 1996. The local effect of intermittency on the inertial subrange energy spectrum of the atmospheric surface layer, Boundary Layer Meteorology, 79(1-2): 35-50. Online
Szilagyi, J., 1992. Why can the weighting parameter of the Muskingum channel routing method be negative?, Journal of Hydrology, 138: 145-151. Online
Szilagyi, J., Crago, R. (in press). Comment on “Derivation of a sigmoid generalized complementary function for evaporation with physical constraints” by S. Han and F. Tian. Water Resources Research.

Educational Background

  • MS - Eotvos University, Hungary, Meteorology (1989)
  • MS - University of New Hampshire, Hydrology (1994)
  • PhD - University of California-Davis, Hydrologic Sciences (1997)

SNR Program Area(s)

  • Environmental Science

Affiliations (index)

Professional Organizations

  • American Geophysical Union
    • member Since 1995
  • European Geophysical Union
    • Member 2003

Notable Websites

Areas of Interest

  • Linear systems in hydrology
  • Hydrological forecasting
  • Flow routing
  • Evaporation/ET
  • Watershed hydrology
  • Stream-aquifer interactions

Currently this page only displays grants that were awarded on 1/1/2009 to the present. If a grant was awarded prior to 1/1/2009 and is still active, it will not be displayed on this page.

There no Grants found for this selection.

Graduate Program(s)

Master of Science in Natural Resource Sciences

Doctor of Philosophy in Natural Resource Sciences