TY  - BOOK
AU  - B. Singh
AU  - Mozumdar,S.
AU  - Bharat,D.
ED  - Central Mining Research Station, Council of Scientific and Industrial Research
TI  - Strength of coal-trials with protodya konov index apparatus
U1  - 622.(54) 
PY  - 1966///
CY  - Dhanbad
PB  - Central Mining Research Station
ER  -