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Die Vögel der Insel Curaçao : nach einer von Herrn cand. theol. Ernst Peters daselbst angelegten Sammlung - Berlepsch, Sittich Hans,‏ ‎ Freiherr von, 1857 -1933 (G. Pätz, 1892)

Die Vogel Ost-Afrikas. Baron Carl Claus von Deer Decken's Reisen in Ost-Africa. Bd. 4 - Hartlaub, Gustav, 1814 -1900 (C.F. Winter'sche Verlagshandlung, 1870)

De vogels van Guyana (Suriname, Cayenne en Demerara) - Penard, Arthur Philip (E.P. Penard, 1908)

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Western birds - California Field Ornithologists. (California Field Ornithologists, 2002)

Wiener entomologische Monatschrift - Lederer, Julius. (In Commission bei Carl Gerold's Sohn, 1857)

Wiener entomologische Monatschrift - Lederer, Julius. (Carl Gerold's Sohn, 1862)

Wild Bird Conservation Act : oversight hearing before the Subcommittee on Fisheries, Wildlife, and Oceans of the Committee on Resources, House of Representatives, One Hundred Fourth Congress, first session, on the implementation of the Wild Bird Conservation Act of 1992, problems in permitting, and suggestions for improvement, September 28, 1995–Washington, DC - United States. Congress. House. Committee on Resources. (U.S. G.P.O, 1995)

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The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1946)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1948)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1952)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1959)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1965)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1967)