United States Department of Agriculture, Natural Resources Conservation Service, United States Department of the Interior, Bureau of Land Management ; in cooperation with the Arizona Agricultural Experiment Station
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with United States Department of the Interior, Bureau of Land Management, and Montana 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