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Reise, nach den spanischen Ländern in Europa und America in den Jahren 1751-bis 1756, nebst Beobachtungen und Anmerkungen über die merkwürdigen Genwächse - Linné, Carl von, 1707 -1778 (G. A. Lange, 1766)

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)

Relation historique du voyage aux régions équinoxiales du nouveau continent - Humboldt, Alexander von, 1769 -1859 (F. A. Brockhaus, 1900)

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Repertorium specierum novarum regni vegetabilis. Beihefte (Verlag des Repertoriums, 1919)

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

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1913)

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Report of the government scientific expedition to the Bellenden- Ker range upon the flora and fauna of that part of the colony - Hedley, Charles, 1862 -1926 (J. C. Beal, Govt. Printer, 1889)

Report of the State Entomologist on injurious and other insects of the state of New York - Felt, Ephraim Porter, 1868 -1943 (Weed, Parsons and Co.; University of the State of New York, 1917)

Report of the United States Geological Survey of the territories - Lesquereux, Léo, 1806 -1889 (Govt. Print. Off, 1873)

Report on investigations made in Java in the year 1902 - Merrill, Elmer D. (Elmer Drew), 1876 -1956 (Bureau of Public Printing, 1903)

Report on the agricultural resources and capabilities of Hawaii - Stubbs, William Carter, 1846 -1924 (Govt. Print. off, 1901)

Report on the forests of North America, exclusive of Mexico - Sargent, Charles Sprague, 1841 -1927 (Govt. Print. Off, 1884)

Report on the forests of North America (exclusive of Mexico) - Sargent, Charles Sprague, 1841 -1927 (G.P.O, 1884)

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Report on the progress and condition of the U.S. National Museum for the year ending June 30 ... - United States National Museum (G.P.O, 1910)

Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873-76 under the command of Captain George S. Nares ... and the late Captain Frank Tourle Thomson, R.N - Thomson, C. Wyville, Sir, (Charles Wyville), 1830 -1882 (Neill, 1885)

Report on the vegetation of the Andaman Islands. Accompanied by a report on the forests and a map - Kurz, Wilhelm Sulpiz, 1834 -1878 (Office of Superintendent of Government Printing, 1870)

Report (to accompany bill S. no. 241) - Linn, Lewis Fields, 1795 -1843 (Blair & Rives, printers, 1838)

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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)

Revisio generum plantarum vascularium omnium atque cellularium multarum secundum leges nomenclaturae internationales cum enumeratione plantarum exoticarum in itinere mundi collectarum, mit erläuterungen - Kuntze, Otto, 1843 -1907 (A. Felix [etc., etc.], 1891)

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Revision de plantas vasculares Filipinas :memoria elevada al Escmo. Sr. Ministro de Ultramar - Vidal y Soler, Sebastián, 1842 -1889 (Estab. tipo-litográfico de M. Perze, 1886)

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Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes:Pseudochromidae) - Gill, Anthony C. (South African Institute for Aquatic Biodiversity, 2004)

A revision of the mygalomorph spider genus Idioctis (Araneae, Barychelidae) - Raven, Robert J. (American Museum of Natural History, 1988)

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Revista do Museu Paulista - Museu Paulista (O Museu, 1922)

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Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1978)

Revue critique de paléozoologie et de paléophytologie (M. Cossman, 1897)

Revue de mycologie - Laboratoire de cryptogamie, Paris (Laboratoire de cryptogamie, 1969)

Revue des sciences naturelles (1878)

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Revue générale de botanique (Libraire générale de l'enseignement, 1900)

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Revue horticole (Librairie agricole de la maison rustique, 1889)