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Synonymia botanica locupletissima generum, sectionum vel subgenerum ad finem anni 1858 promulgatorum : In forma conspectus systematici totius regni vegetabilis schemati Endlicheriano adaptati - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (Sumptibus T. Fischer, 1870)

Synopsis of native, recent mammals of Ellis County, Kansas - Choate, Jerry R. (Museum, Texas Tech University, 1975)

Synopsis of the flora of Colorado - Coulter, John Merle, 1851 -1928 (Govt. print. off, 1874)

Synoptical flora of North America - Gray, Asa, 1810 -1888 (American Book Company, 1895)

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Three thousand flowers : offer 49A, 1948 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rex D. Pearce, 1948)

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Torreya - Torrey Botanical Club. (Torrey Botanical Club, 1921)

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Vollständige synonymik der bis zum ende des jahres 1870 publicirten botanischen gattungen, untergattungen und abtheilungen : zugleich systematische Uebersicht des ganzen Gewächsreiches mit den neueren Bereicherungen und Berichtigungen nach Endlicher's Schema - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (C.B. Griesbach's Verlag, 1887)

Die von dr. Th. Herzog auf seiner zweiten reise durch Bolivien in den jahren 1910 und 1911 gesammelten pflanzen. Teil I - Herzog, Theodor Carl Julius, 1880 -1961 (P.W.M. Trap, 1913)

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