TY  - BOOK
AU  - Kerr,George L.
TI  - Practical coal mining: A manual for managers under-managers, colliery engineers, and others 
U1  - 622.33 23
PY  - 1914///
CY  - London
PB  - Charles Griffin, 
KW  - Coal mines and mining
N1  - Includes Indexes
ER  -