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41. Navigability: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Navigability prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:250,000.
42. Northern Victoria Land: Antarctica
1968. Projection: Polar Stereographic Projection: Standard Parallel -71°; Series: USGS Sketch Maps.
43. Pecora Escarpment: Antarctica
1968. Projection: Polar Stereographic Projection: Standard Parallel -80°14'; Series: USGS 1:250,000 Topographic Reconnaissance Series.
44. Physiographic Regions: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Physiographic Regions prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:...
45. Physiography: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.
46. Precipitation Zones: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Precipitation Zones prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:25...
47. Preliminary geologic map of the Vermilion district and adjacent areas, northern Minnesota, M-5
1968. Sims, Paul K., Morey, G.B., Ojakangas, Richard W., and Griffin, W.L. Map showing interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) around the Vermilion area, ...
48. Recreational Sites: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Recreational Sites prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:250...
49. Reeves Névé: Antarctica
1968. Projection: Lambert Conformal Conic Projection: Standard Parallels -72°40' and -75°20'; Series: USGS 1:250,000 Topographic Reconnaissance Series.
50. Relief: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Relief prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:250,000.
51. Relief Inlet: Antarctica
1968. Projection: Lambert Conformal Conic Projection: Standard Parallels -72°40' and -75°20'; Series: USGS 1:250,000 Topographic Reconnaissance Series.
52. SANAE Station: Antarctica
1968. Projection: WGS72 Mercator Projection; Series: United States Navy Antarctic Nautical Charts.
53. Saunders Coast - Marie Byrd Land: Antarctica
1968. Projection: Polar Stereographic Projection: Standard Parallel -71°; Series: USGS Sketch Maps.
54. Simple Bouguer gravity map of Minnesota, Hibbing sheet, M-3
1968. Ikola, R.J. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ...
55. Slope: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Slope prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:250,000.
56. Slope: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.
58. Soils - Generalized for Agricultural Purposes: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Soils - Generalized for Agricultural Purposes prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Met...
59. Soils - Generalized for Urban Purposes: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Soils - Generalized for Urban Purposes prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolit...
60. Soils-Generalized: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.
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