Singh R H <br/><br/>
Role of blue green algae in nitrogen economy of Indian agriculture 

 -  1961 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>50417 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Algae<br/>Botany
<br/><br/><label>Dewey Class. No.: </label>I220aj:241, K1;1