A study of mine roof of the coking district of Western Pennsylvania / by J.W. Paul and L.N. Plein.
Saved in:
| Main Author: | |
|---|---|
| Corporate Author: | |
| Other Authors: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of the Interior, Bureau of Mines,
1935.
|
| Series: | Technical paper (United States. Bureau of Mines) ;
563. |
| Subjects: |