Orcutt Seed and Plant Company : trade price list 1889-1890 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Orcutt Seed and Plant Company, 1889)

Organization lists of the agricultural colleges and experiment stations in the United States : with a list of agricultural experiment stations in foreign countries - United States. Office of Experiment Stations. (G.P.O, 1899)

The organization of agriculture - Pratt, Edwin A., 1854 -1922 (J. Murray, 1904)

Ornamental trees and plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1908)

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

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1915)

Ornithologisches Centralblatt (1881)

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

O.S.U. naturalist - Ohio State University. Biological Club. (Biological Club of Ohio State University, 1903)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1912)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1916)

Our insect foes; how to deal with - Long, Elias A. (Popular gardening pub. co, 1888)

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)

Our insect friends and foes - Duncan, F. Martin (Francis Martin), 1873 -1961 (Methuen, 1911)

Our living world; an artistic edition of the Rev. J. G. Wood's Natural history of animate creation - Wood, J. G. (John George), 1827 -1889 (S. Hess, 1885)

The outline of science : a plain story simply told - Thomson, J. Arthur (John Arthur), 1861 -1933 (G. P. Putnam's sons, 1922)

An outline of the history of phytopathology - Whetzel, Herbert Hice, 1877 -1944 (W.B. Saunders, 1918)

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 zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (Young J. Pentland, 1892)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (D. Appleton & Co, 1892)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (Pentland, 1899)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (H. Frowde and Hodder & Stoughton, 1899)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (Young J. Pentland, 1895)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (D. Appleton & Co, 1895)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (D. Appleton, 1895)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (H. Frowde and Hodder & Stoughton, 1921)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (Humphrey Milford, Oxford University Press, 1929)

Pacific Coast Entomological Conference and special short course in horticulture (University of California, College of Agricluture, Agricultural Experiment Station, 1909)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1916)

Pamphlets on forest protection (1900)

Pamphlets on forestry in West Virginia (1900)

[Pamphlets on viticulture] - California Agricultural Experiment Station. (Superintendent of state printing, 1897)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1934)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1959)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1965)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1991)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1996)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania. (The Society, 1879)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania. (The Society, 1883)

Papers on Diptera - Meade, Richard Henry 1814 -1899 (Smithsonian Institution, 1883)

The parasites of man, and the diseases which proceed from them; a textbook for students and practitioners - Leuckart, Rudolf, 1823 -1898 (Pentland, 1886)

The parasites of man, and the diseases which proceed from them. A text-book for students and practitioners - Leuckart, Rudolf, 1823 -1898 (Y.J. Pentland, 1886)

The parasites of man, and the diseases which proceed from them : a text-book for students and practitioners - Leuckart, Rudolf, 1823 -1898 (Young J. Pentland, 1886)

Parasitic and predaceous insects in applied entomology - Riley, Charles V. (Charles Valentine), 1843 -1895 (Govt. print. off, 1893)

Le parasitisme et la symbiose - Caullery, Maurice, 1868 -1958 (Doin, 1922)

Parasitology - British Society for Parasitology. (Cambridge University Press, 1909)

Parasitology (Cambridge University Press, 1918)

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)

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

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

Peach yellows : a preliminary report - Smith, Erwin F. (Erwin Frink), 1854 -1927 (Dept. of Agriculture, Botanical Division, 1888)

Pecan insects - Turner, William F. (William Franklin), 1887 - (1918)

Pennsylvania State Horticultural Association news - State Horticultural Association of Pennsylvania. (The Association, 1924)

Pest prevention belts - Botanic Gardens (Singapore) (1906)

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