Sord, K. C. <br/><br/>
Selection of ruling gradients / 
K. C. Sord. 
 - Alambagh :  Govt. Press,  1959. 
 - 22 p. ;  24 cm. 
 - Technical monograph ;  no.15 .
<br/><br/><label>Dewey Class. No.: </label>625.1