Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1959)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1964)

Proceedings of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1895)

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Proceedings of the Florida Academy of Sciences - Florida Academy of Sciences. (Rose Printing Co., etc, 1943)

Proceedings of the Indiana Academy of Science - Indiana Academy of Science. ([s.n.], 1893)

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The Proceedings of the Iowa Academy of Science - Iowa Academy of Science (The Academy, 1898)

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Proceedings of the Washington Academy of Sciences - Washington Academy of Sciences (Washington, D.C.) (Washington Academy of Sciences, 1902)

Prodrome de la flore Belge - De Wildeman, Emile 1866 -1947 (Alfred Castaigne, 1899)

Prodrome de la flore Belge - De Wildeman, Emile 1866 -1947 (Alfred Castaigne, 1898)

Prodrome de la flore belge - Wildeman, E. de (Emile), 1866 -1947 (A. Castaigne, 1898)

Prodrome de la flore bryologique de Madagascar, des Mascareignes et des Comores - Renauld, Ferdinand, 1837 -1910 (Impr. de Monaco, 1897)

Prodrome de la flore du Grand-Duché de Luxembourg - Koltz, J. P. J. (Jean Pierre Joseph), 1827 -1907 (L. Schamburger, 1873)

Prodromus florae Batavae - Nederlandsche Botanische Vereeniging, Leyden. (F.E. MacDonald, 1901)

Prof. dr. Thomé's Flora von Deutschland, Österreich und der Schweiz, in wort und bild, für schule und haus ... mit ... - Migula, W. (Walter), 1863 -1938 (1904)

Proposed protocol for a rare plant survey in the lower foothills, Northern East Slopes - Alberta. Fisheries; Wildlife Management Division. (Alberta Sustainable Resource Development, Fisheries & Wildlife Management Division, Resource Status and Assessment Branch, 2001)

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Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1931)

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Rare bryophytes of Oregon - United States. Bureau of Land Management. (U.S. Department of the Interior, Bureau of Land Management, Salem District, 2016)

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Reading Naturalist. Reading - Reading Natural History Society. (1973)

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Reading Naturalist. Reading - Reading Natural History Society. (1995)

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Reise in Ostafrika in den Jahren 1903-1905 : mit Mitteln der Hermann und Elise geb. Heckmann Wentzel-Stiftung : Wissenschaftliche Ergebnisse - Voeltzkow, Alfred, 1860 -1946 (E. Schweizerbartsche Verlagsbuchhandlung, 1908)

Repertorium annuum literaturae botanicae periodicae - Bemmelen, J. A. van. (Erven Loosjes, 1873)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1928)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1917)

Report for the year ... - Moss Exchange Club, (Moss Exchange Club, 1902)

Report for the year ... - Moss Exchange Club, (Moss Exchange Club, 1905)

Report for the year - British Columbia Provincial Museum - British Columbia Provincial Museum. (Printed by A. Sutton [etc.], for the Queen, 1917)

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Report of the Erith and Belvedere Natural History and Scientific Society - Erith; Belvedere Natural History; Scientific Society. (1883)

Report of the Geological Survey of Ohio - Geological Survey of Ohio. (Nevins & Myers, state printers, 1893)

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Report of the scientific results of the voyage of S.Y. "Scotia" during the years 1902, 1903, and 1904, under the leadership of William S. Bruce - Bruce, William S. 1867 -1921 (The Scottish oceanographical laboratory, 1907)

Report on Natal Botanic Gardens and Colonial Herbarium for the year ... - Wood, John Medley, 1827 -1915 ([Durban Botanic Society], 1898)

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 scientific results of the voyage of S.Y. "Scotia" during the years 1902, 1903 and 1904, under the leadership of William S. Bruce - Bruce, William S. 1867 -1921 (Scottish Oceanographical Laboratory, 1912)

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Revised checklist of the mosses of New York State - Ketchledge, Edwin H. (University of the State of New York, State Education Dept, 1980)

A revision of the Encalyptaceae (musci) with particular reference to the North American taxa - Horton, Diana G. (University of Alberta, Dept. of Botany, 1981)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1923)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1874)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1878)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1882)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1886)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1890)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1892)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1894)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1895)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1896)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1897)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1898)

Revue bryologique - Laboratoire de cryptogamie (Muséum national d'histoire naturelle) (Laboratoire de cryptogamie, 1900)