United States Department of Agriculture, Forest Service and Soil Conservation Service ; in cooperation with Colorado Agricultural Experiment Station, Colorado State University
United States Department of Agriculture, Soil Conservation Service ; in cooperation with Jefferson County and the Colorado Agricultural Experiment Station
United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of Agriculture, Forest Service, and Colorado Agricultural Experiment Station
United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of the Interior, Bureau of Land Management, and the Colorado Agricultural Experiment Station