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31. Geology of the Duluth metropolitan area, Bulletin 33, Plate 4

1949. Schwartz, George M. Map of glacial (Quaternary age glacial and stream sediments) deposits of the Duluth Metropolitan Area, scale 1 inch = about 4 miles.

32. Geology of the Duluth metropolitan area, Bulletin 33, Plate 5

1949. Schwartz, George M. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 48 North, Range 15 West, sc...

33. Geology of the Duluth metropolitan area, Bulletin 33, Plate 6

1949. Schwartz, George M. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 48 North, Range 16 West, sc...

34. Geology of the Duluth metropolitan area, Bulletin 33, Plate 7

1949. Schwartz, George M. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 48 North, Range 17 West, sc...

35. Geology of the Duluth metropolitan area, Bulletin 33, Plate 8

1949. Schwartz, George M. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 49 North, Range 15 West, sc...

36. Geology of the Duluth metropolitan area, Bulletin 33, Plate 9

1949. Schwartz, George M. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 49 North, Range 16 West, sc...

37. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 1

1936. Schwartz, George M. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Minneapolis-St. Paul Metropolita...

38. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 2

1936. Schwartz, George M. East-West Cross Sections of the Metropolitan Area, scale 1 inch = about 15,000 feet.

39. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 3

1936. Schwartz, George M. North-South Cross Sections of the Metropolitan Area, scale 1 inch = about 13,000 feet.

40. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 4

1936. Schwartz, George M. Map of the Glacial (Quaternary glacial and stream sediments) Deposits of the Metropolitan Area, scale 1 inch = about 4 miles.