Color maps 66 x 102cm.Imprint: [Bloomington, In] 1961-Dimensions: col. maps 66 x 102 cm.JPEGG4091 .C5 s250 .I5engIndiana. Geological SurveyPublicGeologyRegional geologic map. ChicagoMapsNorthwest--IndianaMichiganIndiana--Calumet RegionIllinoisIllinoisIndiana1961Indiana University