SINGH, J.G.
UNDERGROUND COAL MINING METHODS - VARANASI BRAJ-KALPA 2000 - viii+538p.,23X18Cms.
81-7525-204-9
622.2 S617
UNDERGROUND COAL MINING METHODS - VARANASI BRAJ-KALPA 2000 - viii+538p.,23X18Cms.
81-7525-204-9
622.2 S617