The Online Books Page

Online Books by

Carl Christensen

Additional books from the extended shelves:

Christensen, Carl, 1872-1942: The American ferns of the group of Dryopteris opposita contained in the U.S. National Museum (Smithsonian Institution, 1909) (page images at HathiTrust)
Christensen, Carl, 1872-1942: Den danske botaniske litteratur 1880-1911. (H. Hagerup's forlag, 1913) (page images at HathiTrust; US access only)
Christensen, Carl, 1872-1942: Index Filicum; sive (H. Hagerup, 1913), also by Rodolfo E. G. Pichi Sermolli and International Association for Plant Taxonomy (page images at HathiTrust; US access only)
Christensen, Carl, 1872-1942: Maxonia, a new genus of tropical American ferns (Smithsonian Institution, 1916) (page images at HathiTrust)
Christensen, Carl, 1872-1942: A monograph of the genus Dryopteris (A.F. Høst & Søn, 1912) (page images at HathiTrust; US access only)
Christensen, Carl, 1872-1942: New Ferns from Madagascar (Almqvist & Wiksell, 1916) (page images at HathiTrust; US access only)
Christensen, Carl, 1872-1942: Pteridophyta ([Gothenburg] : [publisher not identified], [1924], 1924) (page images at HathiTrust; US access only)
Christensen, Carl, 1872-1942: Revised list of Hawaiian Pteridophyta (The Museum, 1925) (page images at HathiTrust)
Christensen, Carl, 1872-1942: Revision of the American species of Dryopteris of the group of D. opposita (B. Lunos bogtr., 1907) (page images at HathiTrust; US access only)

See also what's at your library, or elsewhere.

Edited by John Mark Ockerbloom (onlinebooks@pobox.upenn.edu)
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