United States Department of Agriculture, Soil Conservation Service ; in cooperation with North Dakota Agricultural Experiment Station, North Dakota Cooperative Extension Service, and North Dakota State Soil Conservation Committee
United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of the Interior, Bureau of Indian Affairs, and North Dakota Agricultural Experiment Station
United States Department of Agriculture, Soil Conservation Service ; in cooperation with North Dakota Agricultural Experiment Station, North Dakota Cooperative Extension Service and North Dakota State Soil Conservation Committee
United States Department of Agriculture, Soil Conservation Service ; in cooperation with North Dakota Agricultural Experiment Station, North Dakota Cooperative Extension Service, and North Dakota State Soil Conservation Committee