TY  - BOOK
AU  - Virgin,Robert Zerubabel
AU  - Callen,Alfred Copeland
AU  - Rice,George S.
ED  - United States.
TI  - Coal-mine ventilation,
AV  - LC1045 .A25 no. 41b
PY  - 1931///]
CY  - [Washington
PB  - U.S. Govt. print. off.
KW  - Mine ventilation
ER  -