Obras del Excmo. Señor D. Francisco de Arango y Parreño - Arango y Parreño, Francisco, 1765 -1837 (Impr. de Howson y Heinen, 1888)

Observationes botanicae quibus plantae Indiae Occidentalis : aliaeque Systematis vegetabilium ed. XIV illustrantur earumque characteres passim emendantur : cum tabulis aeneis - Swartz, Olof, 1760 -1818 (Sumtu Jo. Jacobi Palmii, 1791)

Observationes botanicae :quibus plantae Indiae Occidentalis aliaeque Systematis vegetabilium ed. XIV illustrantur earumque characteres passim emendantur - Swartz, Olof, 1760 -1818 (Sumtu Jo. Jacobi Palmii, 1791)

Observations on the Coccidae of Egypt - Hall, W. J. (Wilfrid John), 1892 -1965 (Government Press, 1922)

Observations on the gestation of some sharks and rays - Alcock, A. (Alfred), 1859 -1933 (Asiatic Society, 1891)

Observations on the Neilgherries; including an account of their topography, climate, soil, & productions, and of the effects of the climate on the European constitution ... - Baikie, Robert. (Printed at the Baptist mission press, 1834)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1979)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1993)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2010)

Odorographia : a natural history of raw materials and drugs used in the perfume industry : intended to serve growers, manufacturers and consumers - Sawer, John Charles (Gurney & Jackson, 1892)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1863)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1890)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1894)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1906)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1920)

Oesterreichisches botanisches Wochenblatt ([L.W. Seidel], 1851)

Oesterreichisches botanisches Wochenblatt ([L.W. Seidel], 1854)

Official catalogue of exhibitors. Universal exposition. St. Louis, U.S.A. 1904. : Division of exhibits. Department A. Education [to H. Agriculture; J. Horticulture to P. Physical Culture; R. Livestock.] (For the Committee on press and publicity by the official catalogue company inc, 1904)

Ohio Biological Survey notes - Ohio Biological Survey. (Ohio Biological Survey, 1998)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 2017)

Olds' fall catalog 1932 : bulbs, seeds and perennial plants for fall planting - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.L. Olds Seed Company, 1932)

On the growth of plants in closely glazed cases - Ward, N. B. (Nathaniel Bagshaw), 1791 -1868 (J. Van Voorst, 1852)

One hundred and second annual catalogue of high-class seeds, 1903 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (J.M. Thorburn & Co, 1903)

[Opium : historical note = or, The poppy in China.] - China. Hai guan zong shui wu si shu. (Statistical Dept. of the Inspectorate General of Customs, 1889)

The Orchid world. A monthly illustrated journal entirely devoted to orchidology - Wilson, Gurney, 1878 - (Alabaster, Passmore & Sons, ltd., printers], 1911)

Orchidophile; journal des amateurs d'orchideés - Godefroy-Lebeuf, A. (Alexandre), 1844 -1903 (1887)

Ordenanzas de minería y colección de las ordenes y decretos de esta materia posteriores a su publicación, a las que van agregadas las reformas de que son susceptibles algunos de los artículos vigentes de las mismas ordenanzas y dos láminas para explicar los métodos más económicos de disfrutar las vetas - Mexico. Ministerio de Fomento. (Lib. de J. Rosa, 1846)

Oréades - Instituto de Ciências Biológicas da UFMG. Departamento de Botânica. (Departamento de Botânica, U.F.M.G, 1977)

Florist's journal (How and Parsons, 1840)

Florist's journal (How and Parsons, 1846)

Ornamental gardening in Florida - Simpson, Charles Torrey, 1846 -1932 (The author, 1916)

Ornamental nursery stock, broad leaved evergreen trees and plants, deciduous trees and shrubs, conifers, roses, bulbs, perennial and Alpine plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Beverly Hills Nurseries, 1929)

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

Ornamentals, fruit trees, roses : 1922-1923 - Roeding, George Christian, 1868 -1928 (California Nursery Co, 1922)

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

Ornithologie du Pérou - Taczanowski, Władysław, 1819 -1890 (Typographie Oberthur, 1884)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1898)

Our new guide to rose culture - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1902)

Our new guide to rose culture : 1891 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1900)

Our new guide to rose culture : 1899 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1898)

Our new guide to rose culture : 1899 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1899)

Our new guide to rose culture : 1904 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1904)

Our new guide to rose culture : 1904 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1907)

Our new guide to rose culture : 1905 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1906)

Our new guide to rose culture : 1908 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Dingee & Conard Co, 1908)

Our new guide to rose culture and bulb growing : fall 1908 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1908)

Our new guide to rose culture : autumn 1907 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1907)

Our new guide to rose culture : typical D.&C. roses painted from nature - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1903)

Outlines of classification and special morphology of plants - Goebel, K. (Karl), 1855 -1932 (Clarendon Press, 1887)

Outlines of classification and special morphology of plants - Balfour, Isaac Bayley, 1853 -1922 (Clarendon Press, 1887)

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

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)

Palaeontographica Supplement (Theodor Fischer, 1885)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1966)

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, 1956 : to visit the Canal Zone Biological Area, and collect bird specimens in the Canal Zone and on Isla Coiba; Correspondence, film notes, travel notes, newsclippings, expense records, and memorabilia; Correspondents include John Enos Graf, A. Remington Kellogg, James Zetek, and Margaret Wetmore Harlan - Wetmore, Alexander, 1886 -1978 (1956)

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, 1870)

The paradisus londinensis:or coloured figures of plants cultivated in the vicinity of the metropolis - Salisbury, R. A. (Richard Anthony), 1761 -1829 (Printed by D.N. Shury, and published by William Hooker, 1805)

Park's 1940 flower book - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1940)

Park's 1941 flower book - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1941)

Park's autumn list of bulbs, plants and seeds : autumn of 1914 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park, 1914)

Park's flower book : season 1938, 70th anniversary - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1938)

Park's flower book : season 1939 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1939)

Park's illustrated flower book of choice dependable seeds, season of 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1937)

The parks and gardens of Paris, considered in relation to the wants of other cities and of the public and private gardens; being notes on a study of Paris gardens - Robinson, W. (William), 1838 -1935 (Macmillan and co, 1878)

The parks, promenades, & gardens of Paris, described and considered in relation to the wants of our own cities, and the public and private gardens - Robinson, W. (William), 1838 -1935 (J. Murray, 1869)

The parks, promenades & gardens of Paris : described and considered in relation to the wants of our own cities and of public and private gardens - Robinson, W. (William), 1838 -1935 (John Murray, 1869)

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)

Patterson's numbered check-list of North American plants north of Mexico - Patterson, Harry N. (Harry Norton), 1853 -1919 (Patterson, 1892)

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)

Paxton's flower garden - Lindley, John, 1799 -1865 (1853)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1834)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1836)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1837)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1839)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1840)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1841)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1842)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1844)