by W.D. Lee ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by E.A. Nieschmidt ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils, in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with University of Nebraska, Conservation and Survey Division; Lower Big Blue Natural Resources District; and Gage County Board of Commissioners
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with the University of Nebraska, Conservation and Survey Division ... [and others]
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with University of Nebraska Conservation and Survey Division
United States Department of Agriculture, Natural Resources Conservation Service ; in cooperation with University of Nebraska, Conservation and Survey Division
by T.E. Beesley ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by S.R. Bacon ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils in cooperation with the University of Nebraska, Conservation and Survey Division
by F.A. Hayes ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by R.L. Gemmell ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by A.W. Goke ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by R.C. Roberts ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by F.A. Hayes ...[and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by M. H. Layton ... [and others] ; United States Department of Agriculture, Soil Conservation Service ; in cooperation with the University of Nebraska Conservation and Survey Division
by W.D. Lee ...[and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division
by Louis A. Wolfanger ... [and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the State Soil Survey Department of the Conservation and Survey Division, University of Nebraska
by W.J. Moran ...[and others] ; United States Department of Agriculture, Bureau of Chemistry and Soils ; in cooperation with the University of Nebraska State Soil Survey, Department of the Conservation and Survey Division