Sharma, O P <br/><br/>
Textbook of pteridophyta / 
Sharma, O P 
 -  Macmillan & Co Ltd., Londan,  1990 
 - p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pteridophyta; Botany
<br/><br/><label>Dewey Class. No.: </label>587 SHA-T