United States Department of Agriculture, Soil Conservation Service ; in cooperation with University of Florida, Institute of Food and Agricultural Sciences, Agricultural Experiment Stations ; and Soil Science Department ; and Florida Department of Agriculture and Consumer Services
United States Department of Agriculture, Soil Conservation Service ; in cooperation with Ohio Department of Natural Resources, Division of Soil and Water Conservation ; and Ohio Agricultural Research and Development Center
U.S. Department of Agriculture, Soil Conservation Service ; in cooperation with U.S. Department of the Interior, Bureau of Land Management, and Utah Agricultural Experiment Station
United States Department of Agriculture, Soil Conservation Service ; in cooperation with Kentucky Natural Resources and Environmental Protection Cabinet ; and Kentucky Agricultural Experiment Station
compiled by the State Cartographer's Office under the direction of Art Ziegler ; Christina Erikson, assistant editor, Bettejane Wooding, production manager
United States Department of Agriculture, Soil Conservation Service ; in cooperation with Ohio Department of Natural Resources, Division of Water and Soil Conservation, Ohio Agricultural Research and Development Center; and Ohio Cooperative Extension Service