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Cover for Carl Christensen · American Ferns of the Group of Dryopteris Opposita Contained in the U. S. National Museum (Book) (2023)
Book
American Ferns of the Group of D...
Carl Christensen
Cover for Carl Christensen · A Monograph of the Genus D?r?y?o?p?t?e?r?i?s? /by Carl Christensen. (Paperback Book) (2021)
Paperback Book
A Monograph of the Genus D?r?y?o...
Carl Christensen
Cover for Carl Christensen · Index Filicum, sive, Enumeratio Omnium Generum Specierumque Filicum Et Hydropteridum Ab Anno 1753 Ad Finem Anni 1905 Descriptorium ? Adjectis Synonymis Principalibus, Area Geographica, Etc. /Carl Christensen.; Suppl. 4 1934-60 (Paperback Book) (2021)
Paperback Book
Index Filicum, sive, Enumeratio ...
Carl Christensen
Cover for Carl Christensen · Index Filicum, sive, Enumeratio Omnium Generum Specierumque Filicum Et Hydropteridum Ab Anno 1753 Ad Finem Anni 1905 Descriptorium ? Adjectis Synonymis Principalibus, Area Geographica, Etc. /Carl Christensen.; Suppl. 4 1934-60 (Hardcover Book) (2021)
Hardcover Book
Index Filicum, sive, Enumeratio ...
Carl Christensen