Lower Pennsylvanian clay resources of Knox County, Illinois.

Bibliographic Details
Main Author:	Parham, Walter E. (Walter Edward), 1930-
Format:	Book
Language:	English
Published:	Urbana, [publisher not identified] ; 1960.
Series:	Circular (Illinois State Geological Survey) ; 302.
Subjects:	Clay > Illinois > Knox County. Geology, Stratigraphic > Pennsylvanian.

Description
Physical Description:	19 pages : illustrations
Bibliography:	Bibliography: page 19.