A syllabus of Pennsylvania geology and mineral resources /

Bibliographic Details
Main Author:	Ashley, Geo. H. (George Hall), 1866-1951
Format:	Book
Language:	English
Published:	Harrisburg : Department of Internal Affairs, Topographic and Geologic Survey, 1931.
Series:	Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ; G1.
Subjects:	Geology > Pennsylvania. Mines and mineral resources > Pennsylvania. Geology > Pennsylvania > Bibliography.

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