Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1872)

Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1874)

Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1877)

Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1879)

Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1900)

Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1901)

Transactions of the Zoological Society of London - Zoological Society of London. (Published for the Zoological Society of London by Academic Press, 1898)

The treasury of natural history; or, A popular dictionary of animated nature: in which the zoological characteristics that distinguish the different classes, genera, and species, are combined with a variety of interesting information illustrative of the habits, instincts, and general economy of the animal kingdom. To which are added, A syllabus of practical taxidermy, and A glossarial appendix. Embellished with nine hundred woodcuts, expressly engraved for this work - Maunder, Samuel, 1785 -1849 (Longman, Brown, Green, and Longmans, 1852)

A treatise on the geography and classification of animals - Swainson, William, 1789 -1855 (Longman, Rees, Orme, Brown, Green & Longman, Taylor, 1835)

A treatise on the geography and classification of animals - Swainson, William, 1789 -1855 (Printed for Longman, Rees, Orme, Brown, Green & Longman, 1835)

A treatise on the geography and classification of animals - Swainson, William, 1789 -1855 (Printed for Longman, Rees, Orme, Brown, Green & Longman and John Taylor, 1835)

A treatise on the geography and classification of animals - Swainson, William, 1789 -1855 (Printed for Longman, Rees, Orme, Brown, Green & Longman [etc.], 1835)

Die Tropenwelt : nebst Abhandlungen verwandten Inhaltes - Wallace, Alfred Russel, 1823 -1913 (F. Vieweg, 1879)

Type-specimens of birds in the British Museum (Natural History) - British Museum (Natural History) (BM(NH), 1973)

Über das System und die Charakteristik der natürlichen Familien der Vögel - Fitzinger, Leopold Joseph, 1802 -1884 (Kais. Kön. Hof- und Staatsdruckerei, 1856)

United States Exploring Expedition. During the year 1838, 1839, 1840, 1841, 1842 - United States. Congress. (Printed by C. Sherman, 1858)

University of California publications in zoology - University of California, Berkeley. (University Press, 1914)

Untersuchungen über den Bau des Knöchernen Vogelkopfes - Magnus, Hugo. (Wilhelm Engelmann, 1870)

Untersuchungen zur Morphologie und Systematik der Vögel, zugleich ein Beitrag zur Anatomie der Stütz- und Bewegungsorgane - Fürbringer, Maximilian, 1846 -1920 (T. van Holkema, 1888)