TY  - BOOK
AU  - Woodruff, Seth D
TI  - Methods of working in coal and metal mines
U1  - 622.335 WOO 
PY  - 1966///.
CY  - Oxford : 
PB  - Pergamon, 
KW  - Coal mines and mining
KW  - Metal mines and mining
N1  - V.1. Theory and application of rock mechanism to roof control and support problems - V.2. Ground support methods - V.3. Planning and operations
ER  -