TY  - BOOK
AU  - Smith, Cloyde M.
TI  - The effects on mine ventilation of shaft-bottom vanes and improvements in aircourses
U1  - P 622 21st ed.
PY  - 1932///
CY  - Urbana
PB  - University of Illinois
KW  - Coal mines and mining
KW  - Mine ventilation
ER  -