Author: | Lewis, W. H. |
---|---|
Year: | 1986 |
Document Type: | USBI |
Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
SUDOC: | I 28.27: |
Series: | Information circular / United States Department of the Interior, Bureau of Mines ; |
Report Number: | 9074 |
Subjects: | Coal mines and mining |
Mine lighting | |
Link: | https://hdl.handle.net/2027/mdp.39015078470336 |