B. Singh <br/><br/>
Strength of coal-trials with protodya konov index apparatus / 
B. Singh, S. Mozumdar and D. Bharat 
 - Dhanbad :  Central Mining Research Station,  1966 
 - 15 p. :  ill. ;  21 cm. 
 - Reference CMRS M12/30 .
<br/><br/><label>Dewey Class. No.: </label>622.(54)