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1968
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61. Saunders Coast - Marie Byrd Land: Antarctica
1968. Projection: Polar Stereographic Projection: Standard Parallel -71°; Series: USGS Sketch Maps.
62. 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 ...
63. 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.
64. Slope: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.
66. 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...
67. 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...
68. Soils-Generalized: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.
69. Sub-Surface Geological Features: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Sub-Surface Geological Features prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area...
70. Suitability for Extraction: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Suitability for Extraction prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Sca...