Sahni B <br/><br/>
Structure of Zygopteris....Botrychioxylon  Phil Trans Royal Soc London Ser B 222 

 -  Royal Soc of London, London 
 - pp 29-45,pls 6-8;   31*25 
<br/><br/><label>Dewey Class. No.: </label>H6/N32/B11648