000
00250nam a22001217a 4500
999
_c
446
_d
446
020
_a
8176481483
082
_a
363.731
100
_a
Bharat B. Dhar
245
_a
Mining & Environment
260
_a
New Delhi
_b
A P H
_c
2000
300
_a
429
942
_c
BK