prepared by U.S. Department of Agriculture, Soil Conservation Service ; in cooperation with the Colorado Water Conservation Board, Logan County, Colorado and the Town of Sterling, Colorado
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 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 Research Division of the College of Agricultural and Life Sciences, University of Wisconsin
United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of Agriculture, Forest Service, and the Research Division of the College of Agricultural and Life Sciences, University of Wisconsin