A syllabus of Pennsylvania geology and mineral resources, by George H. Ashley.

By: Ashley, Geo. H. (George Hall), b. 1866Material type: TextTextReference number:1391856Series: General geology report ; G1.Publication details: Harrisburg, Pa., Topographic and Geologic Survey, 1931. Description: 160 p. illus., maps (1 fold. col.) 23 cmSubject(s): Geology -- Pennsylvania | Mines and mineral resources -- Pennsylvania
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