TY  - BOOK
T1  - Grouting horizontal drainage holes in coalbeds /
DA  - 1979.
CY  - [Washington] ;
AU  - Aul, George N.
CN  - TN295
CN  - TN295
PB  - Dept. of the Interior, Bureau of Mines,
PP  - [Washington] ;
PY  - 1979.
ID  - 32144
KW  - Coal mines and mining
KW  - Mine gases.
KW  - Methane.
TI  - Grouting horizontal drainage holes in coalbeds /
ER  -