Concentration and size of air-borne dust during drilling in limestone quarries / 
S. Guruswamy...[et al] ; edited by S. Ranga Raja Rao 
 - Dhanbad :  Central Mining Research Station,  1966 
 - 23 p. ;  21 cm. 
 - Reference Central Mining Research Station-H3/23 .
<br/><br/><label>Dewey Class. No.: </label>622.(54)