| Title: | Geology of oil and gas in relation to coal |
| Author: | Ashley, Geo. H. (George Hall), 1866-1951 |
| Author: | Pennsylvania. Bureau of Topographic and Geologic Survey |
| Note: | Bureau of Topographic and Geological Survey, 1920 |
| Link: | page images at HathiTrust |
| No stable link: | This is an uncurated book entry from our extended bookshelves, readable online now but without a stable link here. You should not bookmark this page, but you can request that we add this book to our curated collection, which has stable links. |
| Subject: | Coal mines and mining |
| Subject: | Coal mines and mining -- Pennsylvania |
| Subject: | Natural gas |
| Subject: | Natural gas -- Pennsylvania |
| Subject: | Pennsylvania |
| Subject: | Petroleum |
| Subject: | Petroleum -- Pennsylvania |
| Other copies: | Look for editions of this book at your library, or elsewhere. |
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