A Monograph of the Ophioglossaceae
Clausen, Robert T. (Robert Theodore), 1911-1981
Article
1938
Memoirs of the Torrey Botanical Club
19
Issue: 2
1-177
New York Botanical Garden, LuEsther T. Mertz Library
English
Durham, N.C, Published for the Club by the Seeman Printery, 1889-
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