 |
|
What is coal?
| Author: | Thiessen, Reinhardt, |
|---|---|
| Year: | 1947 |
| Document Type: | USBI |
| Issuing Agency: | United States, Bureau of Mines, |
| SUDOC: | I 28.27:7397 |
| Series: | Information Circular / Bureau of Mines ; |
| Report Number: | 7397 |
| Subjects: | Coal |
| Trees, Fossil | |
| Links: | https://hdl.handle.net/2027/mdp.39015078535690 |
| no.7397 |
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