The Wilson journal of ornithology - Wilson Ornithological Society (Wilson Ornithological Society, 2009)

The Wilson journal of ornithology - Wilson Ornithological Society (Wilson Ornithological Society, 2010)

The Wilson journal of ornithology - Wilson Ornithological Society (Wilson Ornithological Society, 2011)

The Wilson journal of ornithology - Wilson Ornithological Society (Wilson Ornithological Society, 2012)

The Wilson quarterly - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Chapter of the Agassiz Association, 1892)

Winter sunshine - Burroughs, John, 1837 -1921 (Houghton, Mifflin, 1917)

Winter sunshine - Burroughs, John, 1837 -1921 (Houghton, Mifflin, 1901)

Winter sunshine - Burroughs, John, 1837 -1921 (Houghton, Mifflin, 1902)

Wood notes wild, notations of bird music - Cheney, John Vance, 1848 -1922 (Lee and Shepard, 1892)

The writings of John Burroughs - Burroughs, John, 1837 -1921 (Houghton, Mifflin, & co, 1895)

The writings of John Burroughs - Burroughs, John, 1837 -1921 (Houghton, Mifflin, & co, 1889)

The writings of John Burroughs - Burroughs, John, 1837 -1921 (Houghton, Mifflin, & co, 1904)

The writings of John Burroughs - Burroughs, John, 1837 -1921 (Houghton, Mifflin, & co, 1913)

The writings of John Burroughs. [v.1-20 - Burroughs, John, 1837 -1921 (Houghton, Mifflin and Co, 1904)

Wyoming birds and their value to agriculture - Grave, B. H. (Benjamin Harrison), 1878 -1949 (1916)

A year with the birds; a guide to the naming of 100 birds commonly to be seen in Connecticut - Fuertes, Louis Agassiz, 1874 -1927 (1905)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1898)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1906)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1911)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1912)

The Yellowstone National Park - Comstock, Theo. B. (Theodore Bryant), 1849 -1915 (1874)

The young oölogist (1884)

Zeitschrift für die gesammten Naturwissenschaft - Naturwissenschaftlicher Verein für Sachsen und Thüringen in Halle. (Wiegandt, Hempel & Parey, 1854)

Zeitschrift fur Oologie und Ornithologie (H. Hocke, 1912)

Zoe:a biological journal (Zoe Publishing Co, 1893)

Zoologica : scientific contributions of the New York Zoological Society - New York Zoological Society. (1949)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1884)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1886)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1888)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1915)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1919)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1922)

Zoological series - Geological; Natural History Survey of Minnesota. (Geological and Natural History Survey, 1892)

Der Zoologische Garten - International Union of Directors of Zoological Gardens (G. Fischer, Zoologische gesellschaft, 1886)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1885)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1886)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1887)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1888)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1878)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1893)

Zoologischer Anzeiger - Deutsche Zoologische Gesellschaft. (VEB Gustav Fischer Verlag, 1910)

Zoologischer Jahresbericht - Stazione zoologica di Napoli. (R. Friedlander, 1882)

Zoologischer Jahresbericht - Stazione zoologica di Napoli. (R. Friedlander, 1884)

Zoologischer Jahresbericht - Stazione zoologica di Napoli. (R. Friedlander, 1885)

Zoologischer Jahresbericht - Stazione zoologica di Napoli. (R. Friedlander, 1887)

Zoologischer Jahresbericht - Stazione zoologica di Napoli. (R. Friedlander, 1886)

Zoologisches Zentralblatt (W. Engelmann, 1909)

Zoology of Colorado - Cockerell, Theodore D. A. (Theodore Dru Alison), 1866 -1948 (University of Colorado, 1927)