United States Department of Agriculture, Soil Conservation Service ; in cooperation with Purdue University Agricultural Experiment Station and Indiana Department of Natural Resources, Soil and Water Conservation Committee
United States Department of Agriculture, Soil Conservation Service ; in cooperation with Purdue University Agricultural Experiment Station, and the Indiana Department of Natural Resources, Soil and Water Conservation Committee
United States Department of Agriculture, Soil Conservation Service ; in cooperation with Purdue University Agricultural Experiment Station and Indiana Department of Natural Resources, Soil and Water Conservation Committee
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with Purdue University Agricultural Experiment Station and Indiana Department of Natural Resources, Division of Soil Conservation and State Soil Conservation Board