Ornithologie Nordost-Afrika's : der Nilquellen- und Küsten Gebiete des Rothen Meeres und des nördlichen Somal-Landes - Heuglin, Theodor von, 1824 -1876 (T. Fischer, 1871)

Ornithologie Nordost-Afrika's : der Nilquellen- und Küsten Gebiete des Rothen Meeres und des nördlichen Somal-Landes - Heuglin, Theodor von, 1824 -1876 (T. Fischer, 1874)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1893)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1894)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1895)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1896)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1897)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1898)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1899)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1902)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1905)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1907)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1909)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1912)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1913)

Ornithologischer Atlas, oder, Naturgetreue Abbildung und Beschreibung der aussereuropäischen Vogel - Hahn, Carl Wilhelm, 1786 -1835 (C.H. Zeh'sche Buchhandlung, 1834)

Ornithologischer Beitrag zur Fauna Madagascar's. Mit Berücksichtigung der Inseln Mayotta, Nossi-Bé und St. Marie, sowie der Mascarenen und Seychellen - Hartlaub, Gustav, 1814 -1900 (C. Schünemann, 1861)

Ornithology - Jardine, William, 1800 -1874 (W.H. Lizars, 1855)

The ornithology of Illinois - Ridgway, Robert, 1850 -1929 (H. W. Rokker, printer, 1889)

Ornitologia della Papuasia e delle Molucche - Salvadori, Tommaso, 1835 -1923 (G.B. Paravia, 1880)

Ornitologia della Papuasia e delle Molucche : parte prima-[terza] - Salvadori, Tommaso, 1835 -1923 (Stamperia reale G.B. Paravia e co. di I. Vigliardi, 1880)

The Osprey (The Osprey Co, 1900)

Outlines of American ornithology : part 1, Land birds - Baird, Spencer Fullerton, 1823 -1887 (Little, Brown, 1873)

Over vogels van Deli (Sumatra) - Heyst, A. F. C. A. van (1919)

Pacific coast avifauna - Cooper Ornithological Club. (Cooper Ornithological Club, 1917)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 1995)

Panamá : puente biológico : las Charlas Smithsonian del Mes, 1996-1999 - Heckadon Moreno, Stanley. (Instituto Smithsonian de Investigaciones Tropicales, 2001)

Die Papageien - Finsch, O. (Otto), 1839 -1917 (Brill, 1867)

Die Papageien - Finsch, O. (Otto), 1839 -1917 (Brill, 1868)

Papéis avulsos do Departamento de Zoologia - São Paulo Departamento de Zoologia (A Secretaria, 1942)

Papéis avulsos do Departamento de Zoologia - São Paulo Departamento de Zoologia (A Secretaria, 1943)

Papéis avulsos do Departamento de Zoologia - São Paulo Departamento de Zoologia (A Secretaria, 1944)

Papéis avulsos do Departamento de Zoologia - São Paulo Departamento de Zoologia (A Secretaria, 1948)

Papéis avulsos do Departamento de Zoologia - São Paulo Departamento de Zoologia (A Secretaria, 1952)

Paralogy in cladistic biogeography and analysis of paralogy-free subtrees - Nelson, Gareth J. (American Museum of Natural History, 1996)

Parasitology - British Society for Parasitology. (Cambridge University Press, 1916)

Parrots - Cuvier, Georges, baron, 1769 -1832 (Chatto & Windus, 1845)

Patchy distribution and systematics of Oreomanes fraseri (Aves, ?Coerebidae) of Andean Polylepis woodlands - Vuilleumier, François, 1938 -2017 (American Museum of Natural History, 1984)

Perú: Cordillera Escalera-Loreto - Stotz, Douglas F. (Douglas Forrester), 1956 - (The Field Museum, Science and Education, 2014)

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Peru : Maijuna - Alverson, William Surprison (Field Museum, Environment, Culture and Conservation, 2010)

Perú : Cerros de Kampankis - Stotz, Douglas F. (Douglas Forrester), 1956 - (The Field Museum, Environment, Culture, and Conservation, 2012)

Perú, Medio Putumayo-Algodón - Stotz, Douglas F. (Douglas Forrester), 1956 - (Field Museum of Natural History, 2016)

Perú : Nanay-Mazán-Arabela - Alverson, William Surprison (Field Museum, Environmental and Conservation Programs, 2007)

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Pets of the household; their care in health and disease - Earl, Thomas M. (A. W. Livingston's sons, 1895)

Pflügers Archiv für die gesamte Physiologie des Menschen und der Tiere (M. Hager, 1911)

Philippine birds - Du Pont, John E. (John Eleuthère), 1938 -2010 ([Delaware Museum of Natural History], 1971)

The pictorial museum of animated nature - Knight, Charles, 1791 -1873 (C. Cox, 1844)

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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 Belfast Natural History and Philosophical Society - Belfast Natural History; Philosophical Society. (1872)

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, 1956)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1981)

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

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1988)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 2002)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 2005)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 2007)

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

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1911)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1955)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1962)

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

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1982)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1990)

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