The ferns of North America [microform] : colored figures and descriptions, with synonymy and geographical distribution, of the ferns (including the ophioglassaceae) of the United States of America and the British North American possessions
"Vol. I." Part of a CIHM set. For individual microfiches in this set see CIHM microfiche nos. 11197-11199 Includes bibliographical references Filmed from a copy of the original publication held by the Library, National Museums of Canada 43
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