United States Department of Agriculture, Soil Conservation Service ; in cooperation with the University of Florida, Institute of Food and Agricultural Sciences, Agricultural Experiment Stations, and Soil Science Department; and the Florida Department of Agriculture and Consumer Services
cosponsored by U.S. Geological Survey, Agricultural Research Service, Soil Conservation Serivce, Reston, Virginia, February 5-8, 1990 ; compiled by Madge Ertel
United States Department of Agriculture, Soil Conservation Service ; in cooperation with the Research Division of the College of Agricultural and Life Sciences, University of Wisconsin
United States Department of Agriculture, Soil Conservation Service, in cooperation with the United States Department of Agriculture, Forest Service, United States Department of the Interior, Bureau of Land Management, and the Utah Agricultural Experiment Station