United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of Agriculture, Forest Service and the Arkansas Agricultural Experiment Station
United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of Agriculture, Forest Service; Arkansas Agricultural Experiment Station; and United States Department of the Interior, National Park Service
United States Department of Agriculture, Soil Conservation Service in cooperation with United States Department of Agriculture, Forest Service, and Arkansas Agricultural Experiment Station