Protozoa and other protists - Sleigh, Michael A. (E. Arnold, 1989)

The Protozoa, by Gary N. Calkins - Calkins, Gary N. (Gary Nathan), 1869 -1943 (Macmillan, 1901)

The Protozoa - Calkins, Gary N. (Gary Nathan), 1869 -1943 (Macmillan, 1901)

Protozoa in biological research - Calkins, Gary N. (Gary Nathan), 1869 -1943 (Columbia University Press, 1941)

The protozoa of Iowa - Edmondson, Charles Howard, 1876 -1970 (Davenport Academy of Sciences, 1906)

Protozoa of Salt Fork and its tributaries - Waldo, Marie L. (1900)

Protozoa of the Devil's Lake complex, North Dakota - Edmondson, Charles Howard, 1876 -1970 (1920)

Protozoa - Schwager, Conrad. (C.F. Winter, 1883)

Protozoa - Schwager, Conrad. (C.F. Winter, 1887)

Die Protozoen als Krankheitserreger : Nachtraege - Pfeiffer, L. (Ludwig), 1842 -1921 (G. Fischer, 1895)

Protozoology - Hall, Richard P. (Richard Pinkham), 1900 -1969 (Prentice-Hall, 1953)

Protozoology - Kudo, Richard R. (Richard Roksabro), 1886 -1967 (C. C. Thomas, 1954)

Protozoology - Kudo, Richard R. (Richard Roksabro), 1886 -1967 (C.C. Thomas, 1946)

Protozoology - Kudo, Richard R. (Richard Roksabro), 1886 -1967 (Thomas, 1939)

Psycho-physiologische Protisten-Studien, Experimentelle Untersuchungen - Verworn, Max, 1863 -1921 (G. Fischer, 1889)

Quaestiones entomologicae - University of Alberta. Dept. of Entomology. (Dept. of Entomology, University of Alberta, 1965)

A quantitative and statistical study of the plankton of the San Joaquin River and its tributaries in and near Stockton, California, in 1913 - Allen, Winfred Emory, 1873 -1947 (University of California Press, 1920)

Quantitative laws in biological chemistry - Arrhenius, Svante, 1859 -1927 (G. Bell, 1915)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1854)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1855)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1865)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1866)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1873)