Proceedings of the Royal Irish Academy - Royal Irish Academy. (Royal Irish Academy, 1893)

Proceedings of the Royal Physical Society of Edinburgh - Royal Physical Society of Edinburgh. (The Society, 1909)

Proceedings of the Royal Physical Society of Edinburgh - Royal Physical Society of Edinburgh. (The Society, 1915)

Proceedings of the Royal Society of Edinburgh - Royal Society of Edinburgh. (Royal Society of Edinburgh, 1905)

Proceedings of the Royal Society of Edinburgh - Royal Society of Edinburgh. (Royal Society of Edinburgh, 1917)

Proceedings of the Royal Society of London Series B Containing papers of a Biological character - Royal Society (Great Britain) (Printed for the Royal Society and sold by Harrison & Sons, 1905)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1859)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1896)

Proceedings of the Royal Society of Victoria - Royal Society of Victoria (Melbourne, Vic.) (The Society, 1903)

Proceedings of the section of sciences - Koninklijke Akademie van Wetenschappen (Netherlands) (Johannes Müller, 1918)

Proceedings of the section of sciences - Koninklijke Akademie van Wetenschappen (Netherlands) (Johannes Müller, 1919)

Proceedings of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (South London Entomological and Natural history Society, 1910)

Proceedings of the Yorkshire Geological and Polytechnic Society - Yorkshire Geological; Polytechnic Society. (Yorkshire Geological and Polytechnic Society, 1895)

Procès-verbaux - Société Linnéenne de Bordeaux. (1923)

Procès-verbaux - Société Linnéenne de Bordeaux. (1938)

Prodrome de la flore belge - Wildeman, E. de (Emile), 1866 -1947 (A. Castaigne, 1898)

Prof. dr. Thomé's Flora von Deutschland, Österreich und der Schweiz, in wort und bild, für schule und haus ... mit ... - Migula, W. (Walter), 1863 -1938 (1907)

Progress of science in the century - Thomson, J. Arthur (John Arthur), 1861 -1933 (Linscott Pub. Co, 1906)

Progress of science in the century - Thomson, J. Arthur (John Arthur), 1861 -1933 (W. & R. Chambers, Limited, 1908)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1907)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1909)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1914)

Protists and disease : vegetable protists: algae and fungi, including Chytridiineae, various Plassomyxinae, the causes of molluscum contagiosum, smallpox, syphilis, cancer, and hydrophobia - Clarke, J. Jackson (James Jackson), 1860 -1940 (Bailliere, Tindall & Cox, 1922)

Protists and disease. Vegetable protists; Algae and Fungi, including Chytridiineae; various Plassomyxinae, the causes of molluscum contagiosum, smallpox, syphilis, cancer, and hydrophobia; together with the Mycetozoa and allied groups - Clarke, J. Jackson (James Jackson), 1860 -1940 (Baillière, Tindall & Cox, 1922)

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

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)

Protozoa - Schwager, Conrad. (C.F. Winter, 1880)

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