Narayancharyulu, D. A. <br/><br/>
Scientific study of the strength of timber props used in Indian mines / 
D. A. Narayanacharyulu, S. Ramachandra and K. V. Sundaram 
 - Dhanbad :  Central Mining Research Station,  1967 
 - 36 p. :  ill. ;  21 cm. 
 - Reference CMRS-E3/31 .
<br/><br/><label>Dewey Class. No.: </label>622.(54)