Morton, Conrad Vernon,   1905-1972,  <br/><br/>
Studies of fern types/ 
by C. V. Morton. 
 - Washington:  Smithsonian Institution Press,  1967. 
 - 2volume ;   24 cm. 
<br/><br/> 'Bulletin of the United States National Museum.' 
<br/><br/>Bibliographical footnotes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferns--Type Specimens.