herausgegeben im Auftrage der Deutschen Forschungsgemeinschaft von K. Kayser ... [and others] ; Kartographie, Schaffmann & Kluge Landkartenverlag, Berlin
by Arthur E. Taylor ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of Georgia, College of Agriculture
United States Department of Agriculture, Natural Resources Conservation Service and Forest Service ; in cooperation with United States Department of the Interior, Bureau of Indian Affairs and Bureau of Land Management, and Montana Agricultural Experiment Station
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