[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 C.A. Mogen ... [and others] ; United States Department of Agriculture in cooperation with the University of Idaho College of Agriculture and Agricultural Experiment Station
[by Marvin E. Olsen ... and others] ; United States Department of Agriculture, Soil Conservation Service in cooperation with Utah Agricultural Experiment Station