Christensen, Carl Fredrick Albert,    1872- <br/><br/>
Index filicum sive enumeratio ominum generum specierumque filicum et hydropteridum ab anno 1753 ad finem anni 1905 descriptorumm :   adjec tis, synonymis principalibus, area geographica, etc. /  
Carl Fredrick Albert Christensen. 
 - Hafniae :   H. Hagerup,   1906. 
 - lix, [1], 744 p. ;    23 cm. 
<br/><br/>  Carl Christensen. "Catalogus literatureae": p. [132]   Issued in 12 fasciculi, 1905-06.   "Catalogus literatureae": p. [671]-744. 
<br/><br/>"Catalogus literatureae": p. [201]-219. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferns--------<br/>Hydropteride.--------
<br/><br/><label>Dewey Class. No.: </label>587