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The classification of North American coals
| Author: | Fieldner, Arno Carl, |
|---|---|
| Year: | 1929 |
| Document Type: | MAIN |
| SUDOC: | C 22.11:6094 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6094 |
| Subject: | Coal--North America--Classification |
| Link: | https://hdl.handle.net/2027/mdp.39015095078260 |
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