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You searched for: geology Remove constraint geology Subject Geoscientific Information Remove constraint Subject: Geoscientific Information Type Service Remove constraint Type: Service Time Period 1950-1999 Remove constraint Time Period: 1950-1999
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Quaternary Deposits: Illinois, 1979 illinois

1979. Illinois State Geological Survey. Digital representation of the Quaternary Deposits in Illinois map by Lineback (1979). Map scale is 1:500,000. Shows Quaternary deposits that lie at...


Physiographic Divisions: Illinois, 2004 illinois

1993. Illinois State Geological Survey. This is an ESRI feature class showing boundaries for physiographic divisions in Illinois. Data are originally from ISGS Report of Investigations 12...