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Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2006)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2003)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2004)

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Reisen in Britisch-Guiana in den Jahren 1840-1844 : nebst einer Fauna und Flora Guiana's nach Vorlagen von Johannes Müller, Ehrenberg, Erichson, Klotzsch, Troschel, Cabanis und Andern - Ehrenberg, Christian Gottfried, 1795 -1876 (J. J. Weber, 1847)

Reisen in Ost Afrika in 1859-61. Band III : Abteilung 3 Botanik - Decken, Karl Klaus von der, freiherr, 1833 -1865 ([s.n.], 1879)

Répertoire des noms génériques mentionnés dans l'Index kewensis et ses quinze premiers suppléments = Guide to the generic names appearing in the Index Kewensis and its fifteen supplements = Repertorio de los nombres genericos enumerados en el Index Kewensis y sus quince suplementos = Repertorium der im Index Kewensis und seinen fuenfzehn ersten Supplementen erwaehnten Gattungsnamen - Rouleau, Ernest 1916 -1991 (Châtelain, 1981)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1907)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1908)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1909)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1910)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1911)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1905)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1912)

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A revised catalogue of the indigenous flowering plants and ferns of Ceylon - Willis, J. C. (John Christopher), 1868 -1958 (H.C. Cottle, Govt. Printer, 1911)

Revised determinations of Ed. Andre's Colombian ferns, January 1927 - André, Edouard François, 1840 -1911 (1927)

Revised list of the Ferns of Natal - Buchanan, John, 1855 -1896 (1875)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1909)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1910)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1913)

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Revue horticole (Librairie agricole de la maison rustique, 1912)

Revue horticole (Librairie agricole de la maison rustique, 1916)

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 1965)

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 1978)

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 1986)

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 2001)

ri ben zhi wu ming hui - Honda, Masaji 本田正次 1897 -1984 (san sheng tang)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1935)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1937)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1942)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1945)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1946)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1950)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1951)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1960)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1980)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2000)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2004)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2005)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2007)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2008)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2010)

Ruwenzori; an account of the expedition of H. R. H. Prince Luigi Amedeo of Savoy, Duke of the Abruzzi - Keane, A. H. (Augustus Henry), 1833 -1912 (Archibald Constable and Company Limited, 1908)

Ruwenzori : an account of the expedition of Prince Luigi Amedeo of Savoy, duke of the Abruzzi - Savoia, Luigi Amedeo di, duca degli Abruzzi, 1873 -1933 (Dutton, 1908)

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A second century of ferns : being figures with brief descriptions of one hundred new, or rare, or imperfectly known species of ferns from various parts of the world - Hooker, William Jackson, Sir, 1785 -1865 (Dulau, 1864)

A second century of ferns : being figures with brief descriptions of one hundred new, or rare, or imperfectly known species of ferns from various parts of the world - Hooker, William Jackson, Sir, 1785 -1865 (Dulau, 1861)

Second systematic census of Australian plants, with chronologic, literary and geographic annotations - Mueller, Ferdinand von, 1825 -1896 (Printed for the Victorian Government by McCarron. Bird & Co, 1889)

Seeds and plants imported - United States. Department of Agriculture. (G.P.O, 1911)

Select ferns and lycopods: British and exotic - Williams, Benjamin Samuel, 1822 -1890 ([The author], 1868)

Select ferns and lycopods: British and exotic : comprising descriptions of nine hundred and fifty choice species and varieties, accompanied by directions for their management in the tropical, temperate, and hardy fernery - Williams, Benjamin Samuel, 1822 -1890 ([The author], 1873)

Shinsen Nihon shokubutsu zusetsu. Kenka oyobi yoshiruibu - Queiroz, Margareth M. C. (Keigyosha, 1901)

SIDA, contributions to botany - Mahler, William F. (W. F. Mahler, etc.], 2004)

Silva Capensis, or a description of South African forest trees and arborescent shrubs used for technical and economical purposes - Pappe, Karl Wilhelm Ludwig, 1803 -1862 (Ward, 1862)

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Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2014)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2016)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2019)