The radio-TV constructors handbookCarl Frederik Albert Christensen · First published 1967Open the Tome
Den danske botaniske litteraturCarl Frederik Albert Christensen · First published 1913 · Latest edition 1940Open the Tome
Den danske botaniske Litteratur = Bibliographia botanica danicaCarl Frederik Albert Christensen · First published 1940Open the Tome
Asiatic Pteridophyta collected by Joseph F. Rock, 1920-1924Carl Frederik Albert Christensen · First published 1931Open the Tome
On the systematic position of Polypodium vulgareCarl Frederik Albert Christensen · First published 1928Open the Tome
Revised list of Hawaiian PteridophytaCarl Frederik Albert Christensen · First published 1925Open the Tome
Maxonia, a new genus of tropical American fernsCarl Frederik Albert Christensen · First published 1916Open the Tome
Index filicumCarl Frederik Albert Christensen · First published 1906 · Latest edition 1913Open the Tome
A monograph of the genus DryopterisCarl Frederik Albert Christensen · First published 1912Open the Tome
The American ferns of the group of Dryopteris opposita contained in the U.S. National MuseumCarl Frederik Albert Christensen · First published 1910Open the Tome
Index filicum, sive enumeratio omnium generum speciesumque filicum et hydropteridum ab anno 1753 ad finem anni 1905descriptorum, adjectis synonymis principalibus, area geographica etcCarl Frederik Albert Christensen · First published 1906Open the Tome
Index Filicum, sive, enumeratio omnium generum specierumque Filicum et Hydropteridum ab anno 1753 ad finem anni 1905 descriptorum, adjectis synonymis principalibus, area geographica, etcCarl Frederik Albert Christensen · First published 1906Open the Tome
Index filicum,sive, Enumeratio omnium generum specierumque filicum et Hydropteridum ab anno 1753 ad finem anni 1905 descriptorium : adjectis synonymis principalibus, area geographica, etcCarl Frederik Albert Christensen · First published 1906Open the Tome
On the ferns of the Seychelles and the Aldabra groupCarl Frederik Albert Christensen · First published 1904Open the Tome
