Stratigraphic policy of the Illinois State Geological Survey
[by] H.B. Willman, David H. Swann [and] John C. Frye.

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Main Author: Willman, H. B. (Harold Bowen), 1901-
Language(s): English
Published: Urbana, Division of the Illinois State Geological Survey, 1958.
Subjects: Illinois State Geological Survey.
Geology, Stratigraphic.
Rocks > Rocks / Classification and nomenclature.
Geology > Geology / Nomenclature.
Physical Description: 14 p. 26 cm.
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Item Link	Original Source
Full view Information circular / Illinois State Geological Survey ; [no. 249]	University of Illinois at Urbana-Champaign

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