1981. Morey, G.B., Olsen, Bruce M., and Southwick, David L. Map showing interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of East-Central Minnesota, ... Minnesota Geological Survey.
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1981. United States. Soil Conservation Service. Shows land use.; "December 1981."; Includes vicinity map. 103 x 123 centimeters. The Service (Morgantown, W. Va.?).
1981. United States. Soil Conservation Service. Shows land use.; "July 1981."; Includes vicinity map.; On verso: text. 63 x 48 centimeters; 48 x 63 centimeters Scale 1:100,000. The Service (Albuquerque, N.M.?).
1981. United States. Soil Conservation Service. "February 1981. 5,R-38,159."; Includes location map. 82 x 103 centimeters 1:50,000. U.S. Dept. of Agriculture, Soil Conservation Service (Washington.).
1981. United States. Soil Conservation Service. Shows land use.; "January 1981."; Accompanied by: Fact sheet.; Includes location map. 112 x 92 centimeters Scale 1:100,000. The Service (Bozeman, Mont.?).
1981. United States. Soil Conservation Service. Shows land use.; "Interpretations derived from soil map constructed in 1977 by Cartographic Division, Soil Conservation Service, USDA, of Delta Cou... The Service (Washington, D.C.?).
1981. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "October 1980 4-R-37557."; "February 1979 base 4-R-36993." 79 x 74 centimeters. USDA-SCS (Fort Worth, Tex.).
1981. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "December 1980, 5,R-37,537." 102 x 86 centimeters. The Service (East Lansing, Mich.?).
1981. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "8-13-81 5,R-38,298." 99 x 73 centimeters 1:100,000. The Service (Bismarck, N.D.?).
1981. United States. Soil Conservation Service. Shows land use.; "September 1981."; Includes vicinity map. 83 x 61 centimeters. The Service (Boise, Idaho.?).