Lower Pennsylvanian clay resources of Rock Island, Mercer, and Henry Counties, Illinois.

Bibliographic Details
Main Author:	Parham, Walter E. (Walter Edward), 1930-
Format:	Book
Language:	English
Published:	Urbana, [publisher not identified] ; 1961.
Series:	Circular (Illinois State Geological Survey) ; 322.
Subjects:	Clay > Illinois. Geology, Stratigraphic > Pennsylvanian.

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