by D.S. Jennings ... [and others] ; United States Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils and Agricultural Engineering in cooperation with the Utah Agricultural Experiment Station
[by Marvin E. Olsen ... and others] ; United States Department of Agriculture, Soil Conservation Service in cooperation with Utah Agricultural Experiment Station
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with United States Department of Agriculture, Forest Service ... [and others]