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1968
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21. Existing Vegetation: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.
22. Foundation Conditions: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Foundation Conditions prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:...
23. Gambacorta Peak: Antarctica
1968. Projection: Polar Stereographic Projection: Standard Parallel -80°14'; Series: USGS 1:250,000 Topographic Reconnaissance Series.
24. Geology and origin of iron ore deposits of the Zenith mine, Vermilion district, Minnesota, SP-2, Plate 1
1968. Machamer, J.F. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of 17th level of Zenith Mine, scale 1 i...
25. Geology and origin of iron ore deposits of the Zenith mine, Vermilion district, Minnesota, SP-2, Plate 2
1968. Machamer, J.F. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of 18th level of Zenith Mine, scale 1 i...
26. Geology and origin of iron ore deposits of the Zenith mine, Vermilion district, Minnesota, SP-2, Plate 3
1968. Machamer, J.F. Geology cross section diagrams of Zenith Mine, scale 1 inch = about 100 feet.
27. Glaciation Movements: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Glaciation Movements prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:2...
28. High Temperature Zones: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of High Temperature Zones prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1...
29. Historical Landmarks: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Historical Landmarks prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:2...
30. Hobbs Coast - Marie Byrd Land: Antarctica
1968. Projection: Polar Stereographic Projection: Standard Parallel -71°; Series: USGS Sketch Maps.