| Title: | Precautions to be observed in entering abandoned exploratory shafts and pits |
| Author: | Pickard, Byron O., 1882- |
| Author: | United States. Bureau of Mines |
| Note: | U.S. Dept. of the Interior, Bureau of Mines, 1921 |
| 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: | Abandoned coal mines |
| Subject: | Abandoned coal mines -- Accidents |
| Subject: | Abandoned mines |
| Subject: | Abandoned mines -- Risk assessment |
| Subject: | Blackdamp |
| Subject: | Firedamp |
| Subject: | Methane |
| Subject: | Mine gases |
| Subject: | Mine gases -- Safety measures |
| Subject: | Mine safety |
| Subject: | Mine shafts |
| Subject: | Mine shafts -- Safety measures |
| Other copies: | Look for editions of this book at your library, or elsewhere. |
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