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 by Carl Christensen
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