Christensen, C. <br/><br/>
Index Filicum 
C. Christensen. 
 - Koenigstein  Otto Koeltz Antiquariat  1973 
 - x,744p., illus.; 23cm. 
<br/><br/><label>ISBN: </label>3874290484. 
<br/><br/><label>Dewey Class. No.: </label>587.3,  / C36I