The origin of the British flora - Reid, Clement, 1853 -1916 (Dulau, 1899)

Ornis - International Ornithological Committee. (Carl Gerold's Sohn, 1896)

Ornis - International Ornithological Committee. (Carl Gerold's Sohn, 1904)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1898)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1893)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1913)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1917)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1919)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1891)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1904)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1910)

Ornithologisches Jahrbuch (V. Tschusi, 1897)

Ornithologisches Jahrbuch (V. Tschusi, 1900)

Ornithologisches Jahrbuch (V. Tschusi, 1901)

Ornithologisches Jahrbuch (V. Tschusi, 1903)

Ornithologisches Jahrbuch (V. Tschusi, 1904)

Ornithologisches Jahrbuch (V. Tschusi, 1913)

The ornithology of Illinois - Ridgway, Robert, 1850 -1929 (H.W. Rokker, printer, 1889)

Österreichs Holzpflanzen = : Plantae lignosae Imperii Austriaci : eine auf genaue Berücksichtigung der merkmale der Laubblätter gegründete floristische Bearbeitung aller im Österreichischen Kaiserstaate wild wachsenden oder häufig cultivirten Bäume, Sträucher und Halbsträucher - Pokorny, Alois, 1826 -1886 (K.K. Hof- und Staatsdruckerei, 1864)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1903)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1902)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1909)

Our common fruits; a descriptive account of those ordinarily cultivated or consumed in Great Britain - Bernard, William Bayle, Mrs. (F. Warne, 1866)

Our woodland trees - Heath, Francis George, 1843 -1913 (Sampson Low, Marston, Searle, & Rivington, 1878)

Our woodlands, heaths, and hedges a popular description of trees, shrubs, wild fruits, etc., with notices of their insect inhabitants - Coleman, W. S. (William Stephen), 1829 -1904 (Routledge, Warnes, & Routledge, 1859)

Our woodlands, heaths, and hedges : a popular description of trees, shrubs, wild fruits, etc. : with notices of their insect inhabitants - Coleman, W. S. (William Stephen), 1829 -1904 (George Routledge and Sons, 1866)

Outlines of botany : taken chiefly from Smith's Introduction ... For the use of schools and students - Smith, James Edward, 1759 -1828 (Cummings and Hilliard for the author, 1819)

Outlines of creation - Noyce, Elisha. (Ward & Lock, 1858)

Outlines of medical botany :comprising vegetable anatomy and physiology...and a glossary of terms - Reid, Hugo. (Maclachlan, Stewart & Co, 1896)

Over de bevruchting der bloemen in het kempisch gedeelte van Vlaanderen - MacLeod, Julius, 1857 -1919 (Vuylsteke, 1894)

Oversigt over det Kongelige Danske videnskabernes selskabs forhandlinger = Bulletin de l'Académie royale des sciences et des lettres de Danemark - Kongelige Danske videnskabernes selskab. (A.F. Høst, 1896)

Oversigt over det Kongelige Danske videnskabernes selskabs forhandlinger = Bulletin de l'Académie royale des sciences et des lettres de Danemark - Kongelige Danske videnskabernes selskab. (A.F. Høst, 1901)

Oxford gardens, based upon Daubeny's Popular guide to the physick garden of Oxford: with notes on the gardens of the colleges and on the University park - Gunther, R. T. (Robert Theodore), 1869 -1940 (Parker & son; [etc., etc.], 1912)

Oxford gardens. Based upon Daubeny's Popular guide to the physick garden of Oxford : with notes on the gardens of the colleges and on the University Park - Gunther, R. T. (Robert Theodore), 1869 -1940 (Parker, 1912)

Une page d'histoire de la medecine : la thérapeutique sous les premiers Césars - Lépine, R. (Raphael), 1840 -1919 (F. Alcan, 1890)

Die palaearktischen tortriciden. Eine monographische darstellung mit 24 tafeln in farbendruck, einer stammtafel und mehreren abbildungen im text. Mit einer unterstützung des "Elizabeth-Thompson-science fund" in Boston bearb. von dr. J. Kennel - Kennel, Julius von, 1854 -1939 (E. Schweizerbart, 1921)

Palaeontographica (Theodor Fischer, 1846)

Palestine Exploration Fund : quarterly statement - Palestine Exploration Fund. (The Fund, 1891)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1884)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1885)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1886)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1887)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1888)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1890)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1895)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1896)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1900)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1904)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1907)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1914)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1916)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1917)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1918)

Pamphlets on silviculture (1899)

Pan Apum, eller Afhandling om de örter, af hvilka bien hälft draga deras honung och vax - Kungl. Svenska vetenskapsakademien. (Tryckt hos Direct. Lars Salvius, 1768)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1949)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1979)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1990)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1998)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 2000)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 2002)

Papers on Coccidae or scale insects - United States. Bureau of Entomology. (Government Printing Office, 1908)

Papers on insects injurious to citrus and other subtropical fruits - Horton, John Raymond. (Govt. print. off, 1911)

Papillons d'Europe, peints d'après nature - Devillers, Charles, 1724 -1809 (Chez P.M. Delaguette, imprimeur-libraire, 1788)

The parasitic fungi of New Jersey - Schwarze, Carl Alois, 1886 - (New Jersey Agricultural Experiment Stations, 1917)

I parassiti vegetali delle piante coltivate od utili - Ferraris, Teodoro. (Sineo & Bo, 1913)

Part first of a supplement to the Cybele Britannica : to be continued occasionally as a record of progressive knowledge concerning the distribution of plants in Britain - Watson, Hewett Cottrell, 1804 -1881 (Printed for private distribution, 1860)

Part I. The living flora of West Virginia - Millspaugh, Charles Frederick, 1854 -1923 (Wheeling news litho. co, 1913)

Pathological plant anatomy - Küster, E. (Ernst), 1874 -1953 (1913)

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

Paxton's Botanical dictionary; comprising the names, history, and culture of all plants known in Britain; with a full explanation of technical terms. New ed. including all the new plants up to the present year - Paxton, Joseph, Sir, 1803 -1865 (Bradbury, Evans, & co, 1868)

Pear growing in California - Weldon, Geo. P. (George Percival), 1880 - (State Print. Off, 1918)

Pear growing in California : a practical treatise designed to cover some of the important phases of pear culture within the state - Weldon, Geo. P. (George Percival), 1880 - (State Print. Off, 1918)

The pears of New York - New York State Agricultural Experiment Station. (J. B. Lyon company, 1921)

The pears of New York - New York (State). Dept. of Agriculture. (J. B. Lyon company, 1921)

The pears of New York - New York (State). Dept. of Agriculture. (J.B. Lyon Co, 1921)