by P.R. McMiller ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry ; in cooperation with the University of Minnesota Agricultural Experiment Station
prepared by the Minnesota Soil Survey staff of the U.S. Department of Agriculture Soil Conservation Service in cooperation with the Minnesota Agricultural Experiment Station
by C. S. Simmons ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry ; in cooperation with the Univeristy of Minnesota Agricultural Experiment Station
Date
[1941]
Series
U. S. Bureau of plant industry. [Soil survey report] Series 1935 ; no. 15