Schwartz, George M. (George Melvin), 1892-1980Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Minneapolis-St. Paul Metropolitan District, scale 1:96,000.PDFengMinnesota Geological SurveyPublicGeology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 1MapsMinnesota1936University of Minnesota