Singh, A.L. . <br/><br/>
Nitrogen Fixation in Indian Rice Fields:Azolla & Blue Green Algae /  Textual Documents 
A.L.Singh&Pushp Lata Singh. 
 - 1st ed / 
 - Bikaner :  Agro Botanical Publishers ,  1989. 
 - 236p. ;  21cm.. 
<br/><br/>Bib 
<br/><br/><label>ISBN: </label>81-85031-15-8 
<br/><br/><label>Subjects--Index Terms: </label>Botany Nitrogen Fixation-Rice Fields Rice Fields-Nitrogen Fixation 
<br/><br/><label>Dewey Class. No.: </label>631.8954  / Si 61 Ni