1981. Ruger, A., cartographer. Bird's-eye view.; Facsimile.; Includes illustrations and index to points of interest. Scale not given. Allen County-Fort Wayne Historical Society.
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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. "Interpretations derived from soil survey published in 1975."; "June 1981."; Includes location map. 69 x 69 centimeters 1:50,000. U.S. Dept. of Agriculture, Soil Conservation Service (Washington.?).
1981. United States. Soil Conservation Service. Includes location map. 76 x 72 centimeters Scale 1:50,000. The Service (Place of publication not identified.).
1981. United States. Soil Conservation Service. "August 1981."; Includes location map. 98 x 55 centimeters Scale 1:50,000. The Service (Place of publication not identified.).
1981. United States. Soil Conservation Service. Includes location map. 66 x 81 centimeters Scale 1:50,000. The Service (Place of publication not identified.).
1981. United States. Soil Conservation Service. Includes location map. 98 x 71 centimeters Scale 1:50,000. The Service (Place of publication not identified.).
8. Monroe Lake
1981. Duthie, Glenn, cartographer. File no. 300-74, 2-23-81.; Includes chart showing recreational facilities.; Text, ill., and location map on verso.; Recreation facilities maintaine... Indiana Dept. of Natural Resources?.
1981. United States. Soil Conservation Service. "Nov. 1981."; Includes location map. 116 x 96 centimeters Scale 1:50,000. U.S. Dept. of Agriculture, Soil Conservation Service (Washington.).
1981. The Purdue historical campus map collection was scanned and georeferenced by Purdue University Libraries. The physical maps were collected as Purdu... Purdue University Libraries.