Die Infusionsthiere auf ihre Entwickelungsgeschichte - Stein, Friedrich, 1818 -1885 (Engelmann, 1854)

Infusoria - Duncan, P. Martin (Peter Martin), 1821 -1891 (1882)

International catalogue of scientific literature - Royal Society (Great Britain) (Published for the International Council by the Royal Society of London, 1914)

An introduction to animal morphology and systematic zoology : pt. I. Invertebrata - Macalister, Alexander, 1844 -1919 (Longmans, Green, 1876)

An introduction to general biology - Sedgwick, W. T. (William Thompson), 1855 -1921 (H. Holt, 1899)

An introduction to general biology - Sedgwick, W. T. (William Thompson), 1855 -1921 (H. Holt, 1895)

An introduction to the study of embryology - Haddon, Alfred C. (Alfred Cort), 1855 -1940 (Griffin, 1887)

An introduction to the study of embryology - Haddon, Alfred C. (Alfred Cort), 1855 -1940 (P. Blakiston, 1887)

An introduction to the study of the comparative anatomy of animals - Bourne, Gilbert C. (Gilbert Charles), 1861 -1933 (Bell, 1900)

An introduction to the study of the comparative anatomy of animals - Bourne, Gilbert C. (Gilbert Charles), 1861 -1933 (Bell, 1909)

An introduction to the study of the comparative anatomy of animals - Bourne, Gilbert C. (Gilbert Charles), 1861 -1933 (G. Bell & sons, 1900)

An introduction to the study of the comparative anatomy of animals - Bourne, Gilbert C. (Gilbert Charles), 1861 -1933 (G. Bell & sons, 1902)

An introduction to the study of the comparative anatomy of animals - Bourne, Gilbert C. (Gilbert Charles), 1861 -1933 (G. Bell & sons, 1919)

An Introduction to the study of the protozoa with special reference to the parasitic forms - Royal College of Physicians of London. (Edward Arnold, 1912)

An introduction to the study of the protozoa : with special reference to the parasitic forms - Minchin, E. A. (Edward Alfred), 1866 -1915 (E. Arnold, 1912)

An introduction to the study of the Protozoa : with special reference to the parasitic forms - Minchin, E. A. (Edward Alfred), 1866 -1915 (E. Arnold, 1917)

An introduction to the study of the Protozoa, with special reference to the parasitic forms - Minchin, E. A. (Edward Alfred), 1866 -1915 (E. Arnold, 1912)

An introduction to the study of the Protozoa, with special reference to the parasitic forms - Minchin, E. A. (Edward Alfred), 1866 -1915 (E. Arnold, 1922)

The invisible world revealed by the microscope ; or, Thoughts on animalcules - Mantell, Gideon Algernon, 1790 -1852 (J. Murray, 1850)

The invisible world revealed by the microscope ; or, thoughts on animalcules - Mantell, Gideon Algernon, 1790 -1852 (J. Murray, 1850)

Isis von Oken - Oken, Lorenz, 1779 -1851 (Expedition der Isis, 1820)