Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1892)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1893)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1895)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1896)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1898)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1899)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1908)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1913)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1841)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1917)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1939)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1987)

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1851)

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1854)

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1856)

Proceedings of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1868)

Proceedings of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1888)

Proceedings of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1890)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1919)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1923)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1927)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1931)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1935)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1953)

Proceedings of the Canadian Institute - Glenny, George, 1793 -1874 (Canadian Institute, 1884)

Proceedings of the Canadian Institute - Glenny, George, 1793 -1874 (Canadian Institute, 1887)

Proceedings of the Davenport Academy of Natural Sciences - Davenport Academy of Natural Sciences. (Academy of Natural Sciences [etc.], 1885)

Proceedings of the Davenport Academy of Natural Sciences - Davenport Academy of Natural Sciences. (Academy of Natural Sciences [etc.], 1910)

Proceedings of the Essex Institute - Essex Institute. (Essex Institute Press, 1860)

Proceedings of the Indiana Academy of Science - Indiana Academy of Science. ([s.n.], 1894)

Proceedings of the Indiana Academy of Science - Indiana Academy of Science. ([s.n.], 1895)

Proceedings of the Indiana Academy of Science - Indiana Academy of Science. ([s.n.], 1902)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1891)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1901)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1951)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1980)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1991)

The Proceedings of the Iowa Academy of Science - Iowa Academy of Science (The Academy, 1920)

Proceedings of the Linnaean Society of New York ... - Linnaean Society of New York (Linnaean Society of New York, 1933)

Proceedings of the Linnaean Society of New York ... - Linnaean Society of New York (Linnaean Society of New York, 1935)

Proceedings of the Manchester Institute of Arts and Sciences - Manchester Institute of Arts; Sciences. (The Institute, 1900)

Proceedings of the Nebraska Ornithologists' Union - Nebraska Ornithologists' Union at its ... meeting. (1908)

Proceedings of the Ornithological Sub-section of the Biological Section of the Canadian Institute - Royal Canadian Institute. Biological Section. Ornithological Sub-section. (The Institute, 1890)

Proceedings of the third Prairie Conservation and Endangered Species Workshop : February 1992 at Brandon University, Brandon, Manitoba - Provincial Museum of Alberta. (Curatorial Section, Provincial Museum of Alberta, 1992)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1878)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1879)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1880)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1882)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1886)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1887)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1893)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1927)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1938)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1940)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1942)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1954)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1957)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1840)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1857)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1858)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1859)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1896)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1897)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1898)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1911)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1912)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1848)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1901)

The Prothonotary - Buffalo Ornithological Society. (Buffalo Ornithological Society, 1977)

The Prothonotary - Buffalo Ornithological Society. (Buffalo Ornithological Society, 1980)

Protozoology - Kudo, Richard R. (Richard Roksabro), 1886 -1967 (C. C. Thomas, 1954)

Protozoology - Kudo, Richard R. (Richard Roksabro), 1886 -1967 (C.C. Thomas, 1946)

Provincial Museum of Natural History and Enthnology - British Columbia Provincial Museum. (Printed by Richard Wolfenden, 1909)

Provincial Museum of Natural History and Ethnology - British Columbia Provincial Museum. (Printed by R. Wolfenden, 1909)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1890)

The published writings of George Newbold Lawrence, 1844-1891 - Foster, Lyman Spalding. (Govt. Print. Off, 1892)

The Quarterly journal of the Boston Zoological Society - Boston Zoological Society. (The Society, 1883)

Raptor research - Raptor Research Foundation. (Raptor Research Foundation, 1978)

Reise durch Nord-Amerika bis zur Mündung des grossen Fischflusses und an des Küsten des Polarmeeres in den Jahren 1833, 1834 und 1835 - Back, George, 1796 -1878 (J.J. Weber, 1836)

Reise in das innere Nord-America in den Jahren 1832 bis 1834 - Wied, Maximilian, Prinz von, 1782 -1867 (Bei J. Hœlscher, 1839)

Reise in das innere Nord-America in den Jahren 1832 bis 1834 - Wied, Maximilian, Prinz von, 1782 -1867 (Bei J. Hœlscher, 1841)

Reisen in den Vereinigten Staaten, Canada und Mexico - Müller, J. W. von Baron (Johann Wilhelm) 1824 -1866 (F.A. Brockhaus, 1865)

Relationships of endrin and other chlorinated hydrocarbon compounds to wildlife in Montana, 1981-1982 - Weigand, John P. (Wildlife Division, Montana Dept. of Fish, Wildlife, and Parks, 1983)

Repertorio fisico-natural de la isla de Cuba - Poey, Felipe, 1799 -1891 (Impr. del gobierno y capitanía general por S.M. [etc, 1865)

Report of a geological survey of Wisconsin, Iowa, and Minnesota;and incidentally of a portion of Nebraska Territory - United States. General Land Office (Lippincott, Grambo, 1852)

Report of a geological survey of Wisconsin, Iowa, and Minnesota : and incidentally of a portion of Nebraska Territory : made under instructions from the United States Treasury Department - United States. General Land Office. (Lippincott, Grambo & Co, 1852)

Report of a reconnaissance from Carroll, Montana Territory, on the upper Missouri, to the Yellowstone National Park, and return, made in the summer of 1875 - Ludlow, William, 1843 -1901 (Govt. Print. Off, 1876)

Report of an expedition down the Zuni and Colorado rivers - United States. Army. Corps of Topographical Engineers (R. Armstrong, public printer, 1853)

Report of explorations across the Great Basin of the territory of Utah : for a direct wagon-route from Camp Floyd to Genoa in Carson Valley in 1859 - Baird, Spencer Fullerton, 1823 -1887 (G.P.O, 1876)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1837)

Report of the Commissioner of Agriculture ... - United States. Department of Agriculture. (G.P.O, 1863)

Report of the geological exploration of the fortieth parallel - Eaton, Daniel Cady, 1834 -1895 (G.P.O, 1877)

Report of the Geological Survey of Ohio - Geological Survey of Ohio. (Nevins & Myers, state printers, 1882)

Report of the geological survey of Ohio - Geological Survey of Ohio. (Nevins & Meyers, 1882)

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

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, 1885)

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, 1882)

Report of the state zoölogist - Herrick, C. L. (Clarence Luther), 1858 -1904 (1892)

Report of the United States Entomological Commission - United States Entomological Commission. (Govt. print. off, 1878)

Report on a collection of birds and mammals from Vancouver Island - Swarth, Harry S. (Harry Schelwald), 1878 -1935 (University of California Press, 1912)

Report on the agriculture and geology of Mississippi. Embracing a sketch of the social and natural history of the state - Mississippi. State Geologist. (E. Barksdale, State Printer, 1854)

Report on the birds of Minnesota - Hatch, Philo L., 1823 -1904 (1874)

Report on the birds of Pennsylvania. With special reference to the food-habits, based on over three thousand stomach examinations - Pennsylvania. Ornithologist. (E.K. Meyers, State Printer, 1888)

Report on the birds of Pennsylvania : with special reference to the food habits, based on over four thousand stomach examinations - Warren, Benjamin Harry, 1858 -1926 (E.K. Meyers, State Printer, 1890)

Report on the birds of Pennsylvania : with special reference to the food habits, based on over three thousand stomach examinations - Pennsylvania. Ornithologist. (E.K. Meyers, State Printer, 1888)

Report on the birds of Pennsylvania. With special reference to the food-habits, based on over four thousand stomach examinations - Pennsylvania. Ornithologist. (E. K. Meyers, state printer, 1890)

Report on the birds of Pennsylvania; with special reference to the food habits, based on over four thousand stomach examinations - Pennsylvania. Ornithologist. (E.K. Meyers, State Printer, 1890)