Arnold, Chester R.. <br/><br/>
Introduction to Paleobotany /  

 - TMH Ed. /  
 - New Delhi :   Tata McGraw-Hill Publishing Company ,   1972 
 - p.433,ix :  
<br/><br/><label>ISBN: </label>0-07-099213-4 
<br/><br/><label>Dewey Class. No.: </label>I:8  / H7,L2;7