Oesterreichische botanische Zeitschrift (A. Skofitz, 1902)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1906)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1907)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1913)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1914)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1918)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1923)

Öfversigt af Finska vetenskaps-societetens förhandlingar - Suomen Tiedeseura (s.n.], 1910)

Öfversigt af Finska vetenskaps-societetens förhandlingar - Suomen Tiedeseura (s.n.], 1916)

Öfversigt af Finska vetenskaps-societetens förhandlingar - Suomen Tiedeseura (s.n.], 1917)

Öfversigt af Finska vetenskaps-societetens förhandlingar - Suomen Tiedeseura (s.n.], 1918)

Öfversigt af Finska vetenskaps-societetens förhandlingar - Suomen Tiedeseura (s.n.], 1919)

The Ohio journal of science - Ohio Academy of Science. (Ohio Academy of Science, 1912)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1900)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1913)

Les Ombellifères : contributions pluridisciplinaires à la systématique : actes du 2e Symposium International sur les Ombellifères, Centre Universitaire de Perpignan, 18-21 mai 1977 - Cauwet-Marc, A.-M. (Anne-Marie) (Missouri Botanical Garden, 1977)

The onion (ICAR-Directorate of Knowledge Management in Agriculture, Indian Council of Agricultural Research, 2015)

Optical activity and living matter - Gauze, G. F. (Georgiĭ Frant︠s︡evich) 1910 -1986 (Biodynamica, 1941)

Oréades - Instituto de Ciências Biológicas da UFMG. Departamento de Botânica. (Departamento de Botânica, U.F.M.G, 1981)

Organic livestock farming - Indian Council of Agricultural Research. Directorate of Knowledge Management in Agriculture. (Directorate of Knowledge Management in Agriculture, Indian Council of Agricultural Research, 2013)

Die organischen Regulationen, Vorbereitungen zu einer Theorie des Lebens - Driesch, Hans, 1867 -1941 (Engelmann, 1901)

The origin of life on the earth - Oparin, Aleksandr Ivanovich, 1894 -1980 (Academic Press, 1957)

O.S.U. naturalist - Ohio State University. Biological Club. (Biological Club of Ohio State University, 1902)

Outlines of bacteriology (technical and agricultural) - Ellis, David, 1874 -1937 (Longmans, Green, and co, 1909)

Outlines of bacteriology (technical and agricultural) - Ellis, David, 1874 -1937 (Longmans, Green and co, 1909)

Pacific science - University of Hawaii. (University Press of Hawaii, 1967)

Pacific science - University of Hawaii. (University Press of Hawaii, 1968)

Palladin's Plant physiology - Hopping, Aleita, 1890 - (P. Blakiston's son, 1926)

Paludism - King's College London. (New Sydenham Society, 1893)

Pamphlets - Council for Scientific; Industrial Research (Australia) (Govt. Printer, 1918)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1988)

Papers on bacteriology and allied subjects - Russell, H. L. (Harry Luman), 1866 -1954 (1921)

Papers on bacteriology and allied subjects, by former students of Harry Luman Russell - Russell, H. L. (Harry Luman), 1866 -1954 (1921)

Parasitic diseases of poultry - Theobald, Fred. V. (Frederick Vincent), 1868 -1930 (Gurney, 1896)

Pasteur et le transformisme - Blaringhem, Louis, 1878 -1958 (Masson et cie, 1923)

Pasteur; histoire d'un esprit - Duclaux, Emile, 1840 -1904 (Charaire, 1896)

Pasteur; the history of a mind - Duclaux, Emile, 1840 -1904 (W.B. Saunders company, 1920)

Pasteur; the history of a mind - Duclaux, Emile, 1840 -1904 (W. B. Saunders Co, 1920)

Pasteur : the history of a mind - Duclaux, Emile, 1840 -1904 (W.B. Saunders, 1920)

Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology) - MacNeal, Ward J., 1881 -1946 (P. Blakiston's Son & Co, 1920)

Pathologische Pflanzenanatomie. In ihren Grundzügen - Küster, Ernst, 1874 -1953 (G. Fischer, 1916)

The Peanut, the unpredictable legume; a symposium - Arant, F. S. (Frank Selman), 1904 - (National Fertilizer Association, 1912)

Pennaraptoran theropod dinosaurs : past progress and new frontiers - Novas, Fernando E (American Museum of Natural History, 2020)

Perspectives and horizons in microbiology, a symposium - Waksman, Selman A. (Selman Abraham), 1888 -1973 (Rutgers University Press, 1955)

Pesticides documentation bulletin - National Agricultural Library (U.S.) (National Agricultural Library, U.S. Dept. of Agriculture, #c 1965-1969, 1965)