Nebraska Soils
For the purpose of this map, the soils of Nebraska have been grouped into 80 soil associations. A soil association is a grouping of soil series geographically associated in a characteristic repeating pattern and directly related to topographic areas such as uplands, terraces and bottom lands. They are numbered in the order of their estimated extent within the state; that is, the association with the most acreage is number 1 and that with the least acreage is number 80 (an estimation of the acreages is given after the association name).