Zoology for high schools and colleges - Packard, A. S. (Alpheus Spring), 1839 -1905 (H. Holt and company, 1893)

Zoology for high schools and colleges - Packard, A. S. (Alpheus Spring), 1839 -1905 (H. Holt and Company, 1880)

Zoology for medical students - Kerr, John Graham, 1869 -1957 (Macmillan and co., ltd, 1921)

Zoology : for students and general readers - Packard, A. S. (Alpheus Spring), 1839 -1905 (Henry Holt, 1879)

The zoology of Captain Beechey's voyage - Beechey, F. W. (Frederick William), 1796 -1856 (H.G. Bohn, 1839)

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

Zoology : a systematic account of the general structure, habits, instincts, and uses of the principal families of the animal kingdom - Carpenter, William Benjamin, 1813 -1885 (Wm. S. Orr, 1848)

Zöology; a textbook for colleges and universities - Cockerell, Theodore D. A. (Theodore Dru Alison), 1866 -1948 (World book company, 1920)

Zoophilacium Gronovianum : exhibens animalia quadrupeda, amphibia, pisces, insecta, vermes, mollusca, testacea, et zoophyta - Gronovius, Laurentius Theodorus, 1730 -1777 (Apud Theodorum Haak et Socium et Samuelem et Johannem Luchtmans, 1781)

Zoophilacium Gronovianum : exhibens animalia quadrupeda, amphibia, pisces, insecta, vermes, mollusca, testacea, et zoophyta - Gronovius, Laurentius Theodorus, 1730 -1777 (Apud Theodorum Haak et Socium et Samuelem et Johannem Luchtmans, 1763)

Zur Kenntniss des Lebens in den stehenden Kleingewässern auf den Skäreninseln - Levander, K. M. (Kaarlo Mainio) ([publisher not identified], 1900)

Zur Lehre vom bau und Leben der contractilen Substanz der niedersten Thiere - Ecker, Alexander, 1816 -1887 (1846)

Zur Lehre vom Generationswechsel und der Fortpflanzung bei Medusen und Polypen - Gegenbaur, C. (Carl), 1826 -1903 (Stahel, 1854)

Известия на Царските природонаучни институти в София = Izvestiia na Tsarskitia prirodonauchni instituti v Sofiia - Tsarskitie prirodonauchni instituti (Sofiia, Bulgaria) (Pechatnitsa P. Glushkov, 1942)