Biswas,  Chhaya <br/><br/>
Gymnosperms,  
Chhaya  Biswas  and  B.  M.  Johri 
 - New  Delhi  Narosa  Publishing  House  1997 
 - xxii, 494p.:  ill.;  24cm. 
<br/><br/><label>ISBN: </label>8173190801 
<br/><br/><label>Dewey Class. No.: </label>585  /  BIS