Spores from the Herrin (no.6) coal bed in Illinois /

Bibliographic Details
Main Author:	Schopf, James M. (James Morton), 1911-1978
Format:	Book
Language:	English
Series:	Report of investigations (Illinois State Geological Survey) ; no. 50.
Subjects:	Coal > Illinois. Paleobotany > Illinois.

Description
Physical Description:	73 pages : illustrations
Bibliography:	"References": pages 53-55.