Okens Lehrbuch der Naturgeschichte - Oken, Lorenz, 1779 -1851 (Bei Carl Heinrich Reclam, 1815)

On some insect deformities / by Hermann A. Hagen - Hagen, Hermann August, 1817 -1893 (University Press, 1876)

On the compound vision and the morphology of the eye in insects - Lowne, B. T. (Benjamin Thompson), 1839 -1925 (Printed for the Linnean Society by Taylor and Francis, 1884)

On the Diptera of St. Vincent (West Indies) - Aldrich, John Merton, 1866 -1934 (Royal Entomological Society of London, 1896)

On the history and natural arrangement of insects - Shuckard, William Edward, 1802 -1868 (Printed for Longman, Brown, Green & Longman's Paternoster Row, 1840)

On the history and natural arrangement of insects - Shuckard, William Edward, 1802 -1868 (Printed for Longman, Orme, Brown, Green, & Longmans [etc.], 1840)

On the instincts and habits of the solitary wasps - Peckham, Elizabeth G. (Elizabeth Gifford), 1854 -1940 (Published by the state, 1898)

On the modifications of the simple and compound eyes of insects - Lowne, B. T. (Benjamin Thompson), 1839 -1925 (Royal Society, 1878)

On the power, wisdom and goodness of God, as manifested in the creation of animals, and in their history, habits and instincts - Kirby, William, 1759 -1850 (Carey, Lea & Blanchard, 1836)

On the senses, instincts, and intelligence of animals, with special reference to insects - Lubbock, John, Sir, 1834 -1913 (K. Paul, Trench, 1889)

On the senses, instincts, and intelligence of animals : with special reference to insects - Lubbock, John, Sir, 1834 -1913 (Kegan Paul, Trench & Co, 1889)

On the senses, instincts, and intelligence of animals, with special reference to insects - Lubbock, John, Sir, 1834 -1913 (D. Appleton and Company, 1888)

On the senses, instincts, and intelligence of animals : with special reference to insects - Lubbock, John, Sir, 1834 -1913 (Kegan Paul, Trench, 1888)

Opuscoli scientifici d'entomologia, di fisica e d'agricoltura - Termeyer, Ramón María, 1737 -1814 (Nella Stamperia del Giornale italico di Carlo Dova, contrada S. Rafaello, num. 998, 1807)

The Orchadian - Australasian Native Orchid Society (The Society, 1967)

The Orchadian - Australasian Native Orchid Society (The Society, 1963)

The Orchadian - Australasian Native Orchid Society (The Society, 1991)

Orchard insects of the Pacific Northwest and their control - Newcomer, E. J. (Erval Jackson), 1890 - (U.S. Dept. of Agriculture, 1933)

Orchard insects of the Pacific Northwest and their control - Newcomer, E. J. (Erval Jackson), 1890 - (U.S. Dept. of Agriculture, 1934)

Orchard insects of the Pacific Northwest and their control - Newcomer, E. J. (Erval Jackson), 1890 - (U.S. Dept. of Agriculture, 1941)

Orchard insects of the Pacific Northwest and their control - Newcomer, E. J. (Erval Jackson), 1890 - (U.S. Dept. of Agriculture, 1942)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1900)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1899)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1907)

Our common insects. A popular account of the insects of our fields, forests, gardens and houses - Packard, A. S. (Alpheus Spring), 1839 -1905 (Naturalists' Agency, 1873)

Our common insects A popular account of the insects of our fields, forests, gardens, and houses - Packard, A. S. (Alpheus Spring), 1839 -1905 (Estes and Lauriat, 1873)

Our insect friends and enemies; the relation of insects to man, to other animals, to one another, and to plants, with a chapter on the war against insects - Smith, John Bernhard, 1858 -1912 (J.B. Lippincott Company, 1909)

Outlines of economic entomology. Designed as a textbook for school and colleges, and as a reference-book for farmers and gardeners - Eberhart, Noble Murray, 1870 - (A. Flanagan, 1888)

Outlines of entomology - Murtfeldt, Mary Esther, 1848 -1913 (Tribune Printing Company, State Printers and Binders, 1891)

Outlines of entomology - Murtfeldt, Mary Esther, 1848 -1913 (Tribune printing company, state printers and binders, 1891)

Outlines of general zoology - Baird, Spencer Fullerton, 1823 -1887 (Rudolph Garrigue, 1851)

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

P.A. Latreille scientiarum et artium instituti Gallici ... Genera crustaceorum et insectorum : secundum ordinem naturalem in familias disposita, iconibus exemplisque plurimis explicata - Latreille, P. A. (Pierre André), 1762 -1833 (Apud Amand Knig, Bibliopolam, 1809)

Palaeontographica (Theodor Fischer, 1867)

Pamphlets on forest protection (1900)

Pamphlets on forestry in Maine (1900)

Pamphlets on forestry in Ohio (1900)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1958)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1968)

Papéis avulsos do Departamento de Zoologia - São Paulo Departamento de Zoologia (A Secretaria, 1945)

A paper on the nomenclature of the parts of the head of insects - Newman, Edward, 1801 -1876 (Printed for the author, by R. Clay, 1834)

[Papers on Diptera] - Kowarz, Ferdinand, 1838 -1914 (Smithsonian Institution, 1879)

Papers on Diptera - Kertész, Kálmán, 1867 -1922 (Smithsonian Institution, 1899)

Papers on Diptera - Hendel, Friedrich, 1874 -1936 (Smithsonian Institution, 1800)

Papers on Tipulidae - Alexander, Charles P. (Charles Paul), 1889 -1981 (s.n.], 1917)

Parasitology - British Society for Parasitology. (Cambridge University Press, 1917)

The Pennsylvania farm journal (A.M. Spangler, 1851)

Pennsylvania farm journal - Darlington, J. L. (A.M. Spangler, 1851)

Periódico zoológico - Sociedad Entomológica Argentina. (Sociedad Entomica Argentina, 1874)

Persische Dipteren von den Expeditionen des Herrn N. Zarudny 1898 und 1901 - Stein, P. (Paul), 1852 -1921 (Akademie der wissenschaften, 1913)

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

Petites nouvelles entomologiques (E. Deyrolle, 1869)

Die Pflanzenwelt Deutschlands; Lehrbuch der Formations- biologie. Eine Darstellung der Lebensgeschichte der wildwachsenden Pflanzenvereine und der Kulturflächen - Graebner, Paul, 1871 -1933 (Quelle & Meyer, 1909)