by A.C. Anderson ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of California Agricultural Experiment Station
[by R.A. Gardner ... and others] ; United States Department of Agriculture, Soil Conservation Service in cooperation with the California Agricultural Experiment Station
United States Department of Agriculture, Soil Conservation Service, in cooperation with United States Department of Agriculture, Forest Service, and University of California Agricultural Experiment Station
R. Earl Storie ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of California Agricultural Experiment Station
by John L. Retzer ... [and others] ; United States Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils and Agricultural Engineering in cooperation with the University of California Agricultural Experiment Station