Petrography of coal in the Houtzdale quadrangle : Clearfield County, Pennsylvania /

Bibliographic Details
Main Author:	Koppe, Edwin F.
Format:	Book
Language:	English
Published:	Harrisburg, [publisher not identified] ; 1967.
Series:	Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ; M55.
Subjects:	Coal > Geology > Pennsylvania > Houtzdale Region.

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