Biswal, Kalpataru <br/><br/>
OPSC General Studies  State Civil Services Examination Preliminary Paper 1 &2 
/  by  Kalpataru Biswal 
 - New Delhi:  Salween Publisher,  2023. 
 - 400 p. 
<br/><br/><label>ISBN: </label>9789384409425 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Maximum use of Resources<br/>Conservation of Resources
<br/><br/><label>Dewey Class. No.: </label>000  / BIS/G