Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 1990)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 1991)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 1992)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 1993)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 2013)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 2014)

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

Old-fashioned gardening; a history and a reconstruction - Tabor, Grace, 1873? - (McBride, Nast & company, 1913)

Omnium stirpium sciagraphia et icones : quibus plantarum et radicum tum in hortis cultarum, tum in vrbium fossis & muris, pratis, aruis, montibus, collibus, nemoralibus, fluviis, riguis & littoralibus, villis & pagis, spontè provenientium, nomina, figura, natura, natales, synonyma, vsus & virtutes, docentur : cum doctissimorum scriptorum circa eas consensu & dissensu - Chabrey, Dominique, 1610 -1669 (Sumptibus Samuelis de Tournes, 1678)

On the Micromygalinae, a new subfamily of mygalomorph spiders (Araneae, Microstigmatidae) - Platnick, Norman I. (American Museum of Natural History, 1982)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank Haak), 1861 -1937 (Frank H. Lattin, 1886)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank Haak), 1861 -1937 (Frank H. Lattin, 1918)

Opisthobranch - Long, Steven J. (S.J. Long & S. Bennett, 1984)

Opuscula ornithologica : notis et addendis, mss - Coues, Elliott, 1842 -1899 (1861)

The Orchadian - Australasian Native Orchid Society (The Society, 2000)

The Orchadian - Australasian Native Orchid Society (The Society, 2002)

The Orchadian - Australasian Native Orchid Society (The Society, 2012)

The Orchadian - Australasian Native Orchid Society (The Society, 2015)

The Orchadian - Australasian Native Orchid Society (The Society, 2016)

The Orchadian - Australasian Native Orchid Society (The Society, 2017)

The Orchadian - Australasian Native Orchid Society (The Society, 2018)

The Orchid review (Orchid Review ltd.], 1903)

The Orchid review (Orchid Review ltd.], 1907)

The Orchid review (Orchid Review ltd.], 1908)

The Orchid review (Orchid Review ltd.], 1916)

The Orchid review (Orchid Review ltd.], 1917)

The Orchid review (Orchid Review ltd.], 1919)

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)

Florist's journal (How and Parsons, 1840)

Florist's journal (How and Parsons, 1842)

Florist's journal (How and Parsons, 1844)

The Ornithologist and oölogist (1887)

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

Our pet herons - Little, Archibald, Mrs., 1926

Own root, pot grown roses : spring-1927-summer only-one price-list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Leedle Floral Company, 1927)

Pacific science - University of Hawaii. (University Press of Hawaii, 1963)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2004)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2012)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2013)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2014)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2015)

Palaeontographica (Theodor Fischer, 1862)

Palaeontographica Americana - Paleontological Research Institution (Ithaca, N.Y.) (Paleontological Research Institution, 1984)

Palaeontology - Palaeontological Association (Palaeontological Association, 1996)

Paléontologie française : description zoologique et géologique de tous les animaux mollusques et rayonnés fossiles de France : comprenant leur application à la reconnaissance des couches - Orbigny, Alcide Dessalines d', 1802 -1857 (Chez l'auteur, 1850)

Pamphlets on forestry in Pennsylvania (1900)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1955)

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, 1999)

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, 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)

Panamic Province molluscan literature : additions and changes from ... - Skoglund, Carol (San Diego Shell Club, 2001)

Papilio - Edwards, Henry, 1827 -1891 (New York Entomological Club, 1883)

Papilio - Edwards, Henry, 1827 -1891 (New York Entomological Club, 1884)

Parrella's 1949 dahlia catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Albert Parrella Dahlia Gardens, 1949)

Parrella's 1950 dahlia catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Albert Parrella Dahlia Gardens, 1950)

Parrella's 1952 dahlia catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Albert Parrella Dahlia Gardens, 1952)

Parrella's 1953 dahlia catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Parrella Dahlia Gardens, 1953)

Parrella's 1954 dahlia catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Parrella Dahlia Gardens, 1954)

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 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)

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

Pennsylvania farm journal - Darlington, J. L. (A.M. Spangler, 1852)

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

Pennsylvania farm journal - Darlington, J. L. (A.M. Spangler, 1855)

The Percheron review - Percheron Society of America. (Percheron Society of America, 1916)

Perspectives - Field Museum of Natural History. (The Museum, 1994)

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

PHS news - Pennsylvania Horticultural Society. (The Society, 1970)

The phylogeny of the species of the genus Agelaia Lepeletier, 1836, one of the basalmost groups of Epiponini, with notes on male genitalia (Hymenoptera: Vespidae; Polistinae) - Andena, Sergio Ricardo (American Museum of Natural History, 2024)

Physiological ecology of fossorial mammals : A comparative study - Contreras, Luis C. (Luis Carlos), 1953 - (1983)

Physis - Sociedad Argentina de Ciencias Naturales. (Asociación Argentina de Ciencias Naturales [etc.], 1915)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1949)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1953)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1954)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1968)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1970)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1971)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1974)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1975)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1979)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1980)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1982)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1984)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1985)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1986)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1987)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1988)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1995)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 2009)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 2010)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 2018)