[by Ralph C. Cole ... and others] ; United States Department of Agriculture, Soil Conservation Service 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
by R. Earl Storie ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry, Soils, and Agricultural Engineering in cooperation with the University of California Agricultural Experiment Station
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with the Regents of the University of California (Agricultural Experiment Station) and the United States Department of the Interior, Bureau of Land Management
by R. Earl Storie ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of California Agricultural Experiment Station