Competitive chemistry 
N. N. Sinha. . . [et al]. 
 - Patna  Good Books  [n.d.] 
 - Varying pagination: ill; 26cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry, Competitive.
<br/><br/><label>Dewey Class. No.: </label>540  / C53C