- Author
-
Diamond, W. P.
|
Oyler, D. C.
|
Fields, H. H.
- Title
- Directionally Controlled Drilling to Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, PA.
- Coporate
- Bureau of Mines, Pittsburgh, PA
- Report
-
RI 8231,
1977,
24 p.
- Keywords
-
mine gases
|
mine ventilation
|
coal mines
- Identifiers
- boring