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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)

American Ferns of the Group of D... (2023)

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)

A Monograph of the Genus D?r?y?o... (2021)

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)

Index Filicum, sive, Enumeratio ... (2021)

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)

Index Filicum, sive, Enumeratio ... (2021)

Carl Christensen