Subba Rao, N.S. <br/><br/>
Biological nitrogen fixation 
N.S. Subba Rao, G.S. Venkataraman and S. Kannaiyan. 
 - 2nd. ed.. 
 - New Delhi  Publication and Information Division,  [n.d.] 
 - iv,111p., 24cm. 
<br/><br/><label>Dewey Class. No.: </label>631.847  / S93B