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Title: Unpublished reports on open file IV :
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Volume: Information circular / Illinois State Geological Survey ; [no. 220]
Creator: Kent, Lois S.
Publisher: Urbana : Illinois State Geological Survey,
Date: 1956.
Physical Description: 19 p. ; 25 cm.
Language: eng
Subject: Mineral files
Geology
Copyright Status: Public domain. Illinois state government document.