Clark Archer's research interests span wide areas of human and analytical geography.  At the undergraduate level, he had a major in Political Science and a minor in Geography for the BA degree (Indiana University).  At the graduate level, he had a major in Geography and a minor in Applied Urban Economics for the MA degree (Indiana University), and a major in Geography and a minor in Political Science for the PhD degree (University of Iowa).  He has published articles, chapters, books, and atlases dealing with such matters as the residential patterns of US metropolitan areas, the population size-ranks of world cities, changing patterns of US agricultural land-values, unclassed choropleth mapping techniques, migration and population change in the US Great Plains from early settlement to the present, voting in US presidential elections from 1788 to 2008, sectional tendencies in US election outcomes, persistence and change in geographical patterns of US federal expenditures including defense outlays, changing employment patterns in the northern Great Plains, and urban settlement in Ghana.  Clark is especially interested in studying meso-scale human geographical patterns which can be addressed effectively using computer-based Geographical Information Systems (GIS) and spatial-statistical analysis techniques to investigate multivariate linkages between political, social, and/or economic processes and human-geographical map patterns.  For example, Clark's research contributions to the "Historical Atlas of US Presidential Elections, 1788-2004" (Congressional Quarterly Press, 2006), with Stephen Lavin, Kenneth Martis, and Fred Shelley, involved historical-geographical research on the geographical locations of US county boundaries at the time of each presidential election for the entire United States, and also historical-political research involving the assembly and geocoding of corresponding county-level presidential voting returns for each election.  One of Clark's most important current projects is the creation of an "Atlas of the Great Plains”, with Stephen Lavin and Fred Shelley, to be published in 2011 by the University of Nebraska Press.  The Center for Great Plains Studies at the University of Nebraska has provided support for the Great Plains Atlas project.  Another current project involves researching geographical patterns of the 2008 US presidential election.  A longer-term project which is in the planning stages is to undertake the creation of an "Atlas of Nebraska".