TY  - BOOK
AU  - Beard,James T.
TI  - Mine gases and ventilation: textbook for students of mining, mining engineers and candidates preparing for mining examinations designed for working out the various problems that arise in the practice of coal mining, as they relate to the safe and effecient operation of mines 
U1  - 622.42 22
PY  - 1920///
CY  - New York
PB  - McGraw-Hill
KW  - Mine ventilation
KW  - Mine gases
KW  - Coal mines and mining
ER  -