Research and service of the Illinois State Geological Survey.- Urbana, IL.- 24 S.: Ill.

1. Verfasser: Frye, John C.
Ort/Verlag/Jahr: 1969.
Schlagworte:
Enthalten in: Illinois State Geological Survey <Urbana-IL>: annual report of the Department of Registration and Education; July 1, 1967 - June 30, 1968
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