Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 5
Description
Structural Contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Minneapolis-St. Paul Artesian Basin, scale 1 inch = about 4 miles.
Schwartz, George M. (George Melvin), 1892-1980 (1936). Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 5. Minnesota Geological Survey. https://reflections.mndigital.org/catalog/mgs:1018 (map)