Additional Authors: | Ashley, Geo. H. |
---|---|
Year: | 1939 |
Document Type: | USBM |
Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
SUDOC: | I 28.7:590 |
Series: | Technical paper / United States Department of the Interior, Bureau of Mines ; |
Report Number: | 590 |
Subject: | Bituminous coal--Pennsylvania |
Link: | https://hdl.handle.net/2027/mdp.39015078485201 |