L'Oiseau et la Revue francaise d'ornithologie - Société ornithologique de France. (Société ornithologique de France, 1942)

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

On the biology of our flat-fishes and on the decrease of our flat-fish fisheries, with some observations showing how to remedy the latter and promote the flat-fish fisheries in our seas east of the Skaw - Petersen, C. G. Joh. (Carl Georg Johannes), 1860 -1928 (Centraltrykkeriet, 1894)

On the setal pattern of caterpillars and pupae - Schierbeek, Abraham, 1887 - (E.J. Brill, 1917)

Opera postuma mathematica et physica anno 1844 detecta quae Academiae scientiarum petropolitanae obtulerunt ejusque auspicus ediderunt auctoris pronepotes Paulus Henricus Fuss et Nicolaus Fuss - Imperatorskai︠a︡ akademīi︠a︡ nauk (Russia) (Eggers et Socius, 1862)

Opinions and declarations rendered by the International Commission on Zoological Nomenclature - International Commission on Zoological Nomenclature (Printed by order of the International Trust for Zoological Nomenclature, 1957)

Orchid plants : general catalogue 1948 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Clarelen Orchids, 1948)

The Orchid review (Orchid Review ltd.], 1898)

The Orchid review (Orchid Review ltd.], 1899)

The Orchid review (Orchid Review ltd.], 1904)

The Orchid review (Orchid Review ltd.], 1923)

The orchid stud-book: an enumeration of hybrid orchids of artificial origin, with their parents, raisers, date of first flowering, references to descriptions and figures, and synonymy. With an historical introduction and 120 figures and a chapter on hybridising and raising orchids from seed - Rolfe, Robert Allen, 1855 -1921 (F. Leslie & co, 1909)

The orchid-stud book : an enumeration of hybrid orchids of artificial origin ... : with an historical introduction ... and a chapter on hybridising and raising orchids from seed - Hurst, C. C. 1870 -1947 (F. Leslie, 1909)

Orchids - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Edward A. Manda, Incorporated, 1937)

Orchids - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Lager & Hurrell, 1939)

Orchids - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L. Sherman Adams Co, 1943)

Orchids, 1930 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Orchidwood, 1930)

Orchids, 1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Orchidwood, Inc, 1932)

Orchids by Wilson : 1950 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Orchids by Wilson, 1950)

Orchids List # 1, summer 1945 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (R.H. Gore, 1945)

Orchids: their culture and management - Watson, William, 1858 -1925 (L. U. Gill, 1903)

Florist's journal (How and Parsons, 1842)

Florist's journal (How and Parsons, 1846)

Ornithological gazetteer of Argentina - Paynter, Raymond A. Jr. (Obtainable from Bird Dept., Museum of Comparative Zoology, Harvard University, 1995)

Oscar y Amanda, ó, Los descendientes de La Abadía - Blanquel, Simón. (Simon Blanquel, 1854)

"Our business is growing" rare plants: choice flower seeds cacti and succulents - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodosia B. Shepherd Co, 1910)

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 specialties : carnations, giant double tuberous-rooted begonias, pelargoniums, palms, orchids, ferns - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (John H. Sievers, 1905)

Our specialties : giant double tuberous-rooted carnations, begonias and pelargoniums - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (John H. Sievers, 1902)

Our specialties : giant double tuberous-rooted carnations, begonias, pelargoniums and orchids - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (John H. Sievers, 1904)

Outlines of entomology, published in connection with the author's annual reports upon injurious insects. Part first. Including the order of coleoptera - LeBaron, William. (State Journal Steam Print, 1874)

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

Oversigt over de i arktiske region hidtil fundne lepidoptera - Schøyen, Wilhelm Maribo, 1844 -1918 (Alb. Cammermeyer, 1880)

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, 1858)

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, 1859)

Ovum - Thomson, Allen, 1809 -1884 ([s.n.], 1856)

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)

Palestine Exploration Fund : quarterly statement - Palestine Exploration Fund. (The Fund, 1895)

[Palms] - Henry A. Dreer (Firm) (Henry A. Dreer, 1911)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1914)

Pamphlets on the lumber industry (1900)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1941)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1961)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1967)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1971)

Panama, 1951 : to visit the Canal Zone Biological Area and to collect bird specimens in Cerro Campana and other points in Panama; Assisted by Watson M. Perrygo. Correspondence, permits, newsclippings, expense records, travel notes, itinerary, film notes, and memorabilia. Correspondents include John Enos Graf, Ratibor Hartmann, John L. Keddy, Louise M. Pearson, Matthew Williams and Marion Illg Stirling, and James Zetek; Of special interest is correspondence from the Stirlings documenting archaeological field work in Panama - Wetmore, Alexander, 1886 -1978 (1951)

Panama, 1954 : to visit the Canal Zone Biological Area and collect bird specimens in Chiriqui. Assisted by Beatrice Thielen Wetmore; The Netherlands Antilles and Venezuela were also visited; Correspondence, newsclippings, reference materials, permits, itinerary, film notes, travel notes, expense records, field report, and memorabilia; Correspondents include John Enos Graf, Watson M. Perrygo, James Zetek, and Adela Gomez - Wetmore, Alexander, 1886 -1978 (1954)

Panama, 1955 : to visit the Canal Zone Biological Area and the Gorgas Memorial Laboratory, and to collect bird specimens in the Canal Zone and Chiriqui. Assisted by Beatrice Thielen Wetmore; Correspondence, permits, newsclippings, film notes, travel notes, expense records, and memorabilia; Correspondents include John Enos Graf, A. Remington Kellogg, and James Zetek - Wetmore, Alexander, 1886 -1978 (1955)

Panama, 1957 : to visit the Canal Zone Biological Area, the Museo Nacional, and the Gorgas Memorial Laboratory; and to collect bird specimens in the Tonosi Valley, Los Santos, San Blas Islands, and the Azuero Peninsula. Assisted by Beatrice Thielen Wetmore; Correspondence, newsclippings, reference materials, travel notes, film notes, expense records, and memorabilia; Correspondents include John Enos Graf, Herbert Friedmann, Herbert Girton Deignan, Henry Allen Moe, and Margaret Harlan Wetmore - Wetmore, Alexander, 1886 -1978 (1957)

Panama, 1958 : to visit the Canal Zone Biological Area and to collect bird specimens in the Canal Zone, Bocas del Toro, Cocle, La Jagua, and on Isla Escudo de Veraguas; Assisted by Beatrice Thielen Wetmore; Correspondence, reference materials, expense records, travel notes, photographs and photographic records, field report, and memorabilia. Correspondents include Herbert Friedmann and Louise M. Pearson - Wetmore, Alexander, 1886 -1978 (1958)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania. (The Society, 1886)

Park and cemetery and landscape gardening - Haight, R. J. (Rufus J.) (R.J. Haight, 1907)

Park's flower book for 1958 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Co, 1958)

Park's novelties and specialties in seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park, 1901)

Parte práctica de botánica del caballero Cárlos Linneo, que comprehende las clases, órdenes, géneros, especies y variedades de las plantas, con sus caracteres genéricos y especificos, sinónimos mas selectos, nombres triviales, lugares donde nacen, y propriedades - Linné, Carl von, 1707 -1778 (En la Imprenta Real, 1784)

Partnerships for sustainable forest ecosystem management : fifth Mexico/U.S. biennial symposium : October 17-20, 1994, Guadalajara, Jalisco, Mexico - Rocky Mountain Forest; Range Experiment Station (Fort Collins, Colo.) (U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1995)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1849)

Pedigrees of English Short-horn bulls, to which American Short-horns trace - Allen, Lewis F. (Lewis Falley), 1800 -1890 (Warren, Johnson, 1874)

Les pensées : histoire, culture, multiplication, emploi - Barillet-Deschamps, Jean-Pierre, 1824 -1873 (J. Rothschild, 1869)

Periodical catalogue of fruit and ornamental trees and plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hopkins & Jennings, Printers, 1843)

The Permian of Mongolia : a report on the Permian fauna of the Jisu Honguer limestone of Mongolia and its relations to the Permian of other parts of the world - Berkey, Charles Peter, 1867 -1955 (American Museum of Natural History, 1931)

Perú : Nanay-Mazán-Arabela - Alverson, William Surprison (Field Museum, Environmental and Conservation Programs, 2007)

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 Pflanzen und Raupen Deutschlands : Versuch einer lepidopterologischen Botanik - Wilde, O. (E.S. Mittler, 1860)

Die Pflanzenfeinde aus der Klasse der Insekten. Ein nach Pflanzenfamilien geordnetes Handbuch sämmtlicher auf den einheimischen Pflanzen bisher beobachteten Insekten zum Gebrauch für Entomologen, Insektensammler, Botaniker, Land- und Forstwirthe und Gartenfreunde - Kaltenbach, J. H. (Johann Heinrich), 1807 -1876 (J. Hoffmann, 1874)

Phegea - Vlaamse Vereniging voor Entomologie. (Vlaamse Vereniging voor Entomologie, 2000)

Phegea - Vlaamse Vereniging voor Entomologie. (Vlaamse Vereniging voor Entomologie, 2003)

Phegea - Vlaamse Vereniging voor Entomologie. (Vlaamse Vereniging voor Entomologie, 2006)

Philadelphia flower show - Pennsylvania Horticultural Society. (The Society, 1994)

The philosophy of zoology, or, A general view of the structure, functions, and classification of animals - Fleming, John, 1785 -1857 (Hurst, Robinson & Co, 1822)

The philosophy of zoology; or, A general view of the structure, functions, and classification of animals - Fleming, John, 1785 -1857 (A. Constable, 1822)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1976)

The pictorial gallery of English race horses : containing portraits of all the winners of the Derby, Oaks and St. Leger Stakes, during the last twenty years ; and a history of the principal operations of the turf - Cooper, Abraham, 1787 -1868 (Henry G. Bohn, 1850)

The pictorial museum of animated nature ... - Knight, Charles, 1791 -1873 (C. Knight, 1844)

The pictorial museum of animated nature - Knight, Charles, 1791 -1873 (C. Cox, 1844)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1934)

Plant life - American Plant Life Society. (American Plant Life Society, 1971)

Plant life - American Plant Life Society. (American Plant Life Society, 1973)

Plantarum vascularium genera :secundum ordines naturales digesta eorumque differentiae et affinitates tabulis diagnostacis expositae - Weidmann. (Libraria Weidmannia, 1836)

Please consult this bulletin when ordering - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Greening Nursery Company, 1948)

The pleasures of a pigeon-fancier - Lucas, Joseph. (S. Low, Marston, Searle, & Rivington, 1886)

Poatkowé rostlinoslowí - Presl, Jan Svatopluk, 1791 -1849 (W kommissí u Kronbergra a iwnáe, 1848)

Points of the horse; a treatise on the conformation, movements, breeds and evolution of the horse - Hayes, M. Horace (Matthew Horace), 1842 -1904 (Hurst and Blackett, limited, 1904)

Polskie pismo entomologiczne = Polish journal of entomology = Bulletin entomologique de Pologne - Polski Zwiazek Entomologiczny (Panstwowe Wydawn. Naukowe, 1922)

The popular encyclopedia; being a general dictionary of arts, sciences, literature, biography, history, and political economy, reprinted from the American edition of the "Conversations lexicon" ... with dissertations on the rise and progress of literature (Blackie, 1900)

The popular natural history - Wood, J. G. (John George), 1827 -1889 (Burt Co, 1884)