Pteridologist - British Pteridological Society. (The Society, 2020)

Ptéridophytes - Tardieu-Blot, Mme., (Laure) 1902 -1998 (1969)

The Pteridophytes of Ohio - Schaffner, John H. (John Henry), 1866 -1939 (The Academy, 1910)

Ptéridophytes : suivis d'une carte des localités du Gabon - Hallé, Nicolas (1964)

pu tong zi ran di li 普通自然地理 - Polovinkin, A. A. (Aleksandr Aleksandrovich) 1887 -1955 (dong bei jiao yu chu ban she 东北教育出版社, 1948)

Publicaciones del Departamento de Zoología - Universidad de Barcelona. Departamento de Zoología. (Ediciones de la Universidad de Barcelona, 1981)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1930)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1936)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1938)

Publication / the Herbarium, Department of Biological Sciences, University of California, Santa Barbara - University of California, Santa Barbara. (the Herbarium, 1984)

[Publications] - Bureau of Government Laboratories - Philippines. Bureau of Government Laboratories. (Bureau of Public Printing, 1905)

qing hai jing ji zhi wu zhi 青海经济植物志 - Guo, Benzhao (郭本兆) (qing hai ren min chu ban she青海人民出版社, 1987)

Quaestiones entomologicae - University of Alberta. Dept. of Entomology. (Dept. of Entomology, University of Alberta, 1977)

Quarterly journal of the Florida Academy of Sciences - Florida Academy of Sciences. (Florida Academy of Sciences, 1959)

Quarterly journal of the Florida Academy of Sciences - Florida Academy of Sciences. (Florida Academy of Sciences, 1966)

Quarterly journal of the Florida Academy of Sciences - Florida Academy of Sciences. (Florida Academy of Sciences, 1972)

Queensland Agricultural Journal - Queensland. Department of Agriculture; Stock. (Queensland Dept. of Primary Industries, 1930)

Queensland Agricultural Journal - Queensland. Department of Agriculture; Stock. (Queensland Dept. of Primary Industries, 1933)

Queensland Agricultural Journal - Queensland. Department of Agriculture; Stock. (Queensland Dept. of Primary Industries, 1935)

Queensland Agricultural Journal - Queensland. Department of Agriculture; Stock. (Queensland Dept. of Primary Industries, 1936)

Range and pasture management - Sampson, Arthur W. (Arthur William), 1884 -1967 (John Wiley, 1923)

Range and wildlife habitat evaluation : a research symposium, Flagstaff and Tempe, Ariz., May 1968 - United States. Branch of Range; Wildlife Habitat Ecology; Management Research. (U.S. Dept. of Agriculture, Forest Service, 1970)

Range plant handbook - Dayton, William A. (William Adams), 1885 - (U. S. Govt. print. off, 1937)

Range plant handbook - Dayton, William A. (William Adams), 1885 - (U.S. Govt. print. off, 1937)

Range plants of Arizona and New Mexico : names, symbols and notations - Rocky Mountain Forest; Range Experiment Station (Fort Collins, Colo.) (Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S.D.A, 1958)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2001)

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, 2006)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2005)

Raptor research - Raptor Research Foundation. (Raptor Research Foundation, 1985)

Reading Naturalist. Reading - Reading Natural History Society. (1961)

Reading Naturalist. Reading - Reading Natural History Society. (1962)

Reading Naturalist. Reading - Reading Natural History Society. (1964)

Reading Naturalist. Reading - Reading Natural History Society. (1978)

Reading Naturalist. Reading - Reading Natural History Society. (1998)

Reading Naturalist. Reading - Reading Natural History Society. (2009)

Reading Naturalist. Reading - Reading Natural History Society. (2010)

Reading Naturalist. Reading - Reading Natural History Society. (2011)

Reading Naturalist. Reading - Reading Natural History Society. (2014)

Reading Naturalist. Reading - Reading Natural History Society. (2015)

Reading Naturalist. Reading - Reading Natural History Society. (2018)

Reading Naturalist. Reading - Reading Natural History Society. (2019)

Reading Naturalist. Reading - Reading Natural History Society. (2023)

Recombinant DNA research : documents relating to "NIH guidelines for research involving recombinant DNA molecules" - National Institutes of Health (U.S.). Office of the Director. (U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, 1976)

A record of plants collected in Southern Rhodesia; arramged on Engler's system - Eyles, Fred (1916)

Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1934)

Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1987)

Records of the South Australian Museum - Public Library, Museum,; Art Gallery of South Australia. (Published under the authority of the board of governors and edited by the museum director, 1946)

Recovery plan for the northern spotted owl - draft - U.S. Fish; Wildlife Service ([U.S. Department of the Interior], 1992)

Recueil de l'Institut botanique (Université de Bruxelles) - Institut botanique Léo Errera. (Henri Lamertin, 1902)

Red list of the endemic plants of the Caucasus : Armenia, Azerbaijan, Georgia, Iran, Russia, and Turkey - Missouri Botanical Garden. (Missouri Botanical Garden Press, 2014)

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, 1914)

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, 1923)

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, 1917)

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

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

Repertorium specierum novarum regni vegetabilis. Beihefte (Verlag des Repertoriums, 1911)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1914)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1925)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1965)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1967)

Report / Botanical Exchange Club and Society of the British Isles - Botanical Exchange Club; Society of the British Isles. (1912)

Report / Botanical Society and Exchange Club of the British Isles - Botanical Society; Exchange Club of the British Isles. (1920)

Report / Botanical Society and Exchange Club of the British Isles - Botanical Society; Exchange Club of the British Isles. (1923)

Report / Botanical Society and Exchange Club of the British Isles - Botanical Society; Exchange Club of the British Isles. (1938)

Report / Botanical Society and Exchange Club of the British Isles - Botanical Society; Exchange Club of the British Isles. (1945)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1912)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1916)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1932)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1938)

Report of the Michigan Academy of Science - Michigan Academy of Science. Council. (The Academy, 1906)

Report of the Michigan Academy of Science - Michigan Academy of Science. Council. (The Academy, 1912)

Report of the Michigan Academy of Science - Michigan Academy of Science. Council. (The Academy, 1913)

Report of the State Botanist - Peck, Charles H. (Charles Horton), 1833 -1917 (University of the State of New York, 1916)

Report to the trustees of Kosciusko State Park on a reconnaisance natural history survey of the Park, January-February 1946 - Linnean Society of New South Wales. (The Committee?, 1946)

Reports of the Survey. Botanical series - Geological; Natural History Survey of Minnesota. (1892)

Reproductive ecology of Conradina verticillata Jennison, a rare, endemic mint of the Cumberland Plateau - Roulston, T'ai Honda. (1994)

Western Australian Herbarium Research Notes - Western Australia. Department of Biodiversity, Conservation; Attractions (Western Australian Herbarium, 1981)

Western Australian Herbarium Research Notes - Western Australia. Department of Biodiversity, Conservation; Attractions (Western Australian Herbarium, 1982)

Resultate der Wissenschaftlichen Erforschung des Balatonsees - Hungary. Földmm̋uvelésügyi Minisztérium. (E. Hölzel, 1897)

Retail price list, 1934 (trade 331/3%) - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Gillett's Fern and Flower Farm, 1934)

Revised checklist of New York State plants - Mitchell, Richard S., 1938 - (University of the State of New York, State Education Dept, 1997)

Revised list of Hawaiian Pteridophyta - Christensen, Carl, 1872 -1942 (The Museum, 1925)

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

Revista de la Academia Canaria de Ciencias - Academia Canaria de Ciencias. (Academia Canaria de Ciencias, 1992)

Revista de la Academia Canaria de Ciencias - Academia Canaria de Ciencias. (Academia Canaria de Ciencias, 2015)

Revista del Jardín Botánico y Museo de Historia Natural del Paraguay - Jardín Botánico (Asunción, Paraguay) (Jardín Botánico y Museo de Historia Natural del Paraguay, 1922)

Revista del Museo de La Plata - Universidad Nacional de La Plata. (Talleres del Museo de La Plata, 1908)

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

Revista do Museu Paulista - Museu Paulista (O Museu, 1929)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1948)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1952)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1960)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1963)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1966)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1970)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1975)

Revue bryologique et lichenologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1973)

Revue de mycologie - Laboratoire de cryptogamie, Paris (Laboratoire de cryptogamie, 1979)

Revue générale de botanique (Libraire générale de l'enseignement, 1914)

La Revue scientifique du Limousin - Le Gendre, Charles, 1841 -1935 (Impr.-Librairie Ve. H. Ducourtieux, 1909)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1957)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1977)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1996)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 2014)

Rhododendrons, azaleas, specimen conifers, rare plants, 1936 : Carolina mountain flowers and hardy native American plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Harlan P. Kelsey, Inc, 1936)

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 1919)

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 1930)

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

Rhodora - Robinson, Benjamin Lincoln, 1864 -1935 (New England Botanical Club [etc.], 1941)