Sarkar, S. K. <br/><br/>
Strate control observations at a longwall face-no.1 / 
S. K. Sarkar, K. P. Mukherjee and Dr. B. Singh 
 - Dhanbad :  Central Mining Research Station,  1967 
 - 78 p. :  ill. ;  21 cm. 
 - Reference Central Mining Research Station-M20/39 .
<br/><br/><label>Dewey Class. No.: </label>622.(54)