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  1. 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.
    By: Christensen, Carl, - Christensen, Carl, - Jarrett, F. M. - Pichi-Sermolli, Rodolfo E. G. - International Association for Plant Taxonomy
    Publication info: Hafniae [Copenhagen] :H. Hagerup,1906.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
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