SINGH , SANJAY KUMAR. <br/><br/>
PTERIDOPHYTA  

 - NEW DELHI  CAMPUS BOOKS  2008 
 - 291:  20CM. 
<br/><br/><label>Subjects--Index Terms: </label>Vascular seedless plants 
<br/><br/><label>Dewey Class. No.: </label>587 SIN