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Obra del cincuentenario del Museo de La Plata by Alfredo B. Steullet, Enrique A. Deautier, Museo de La Plata - 1935
Obras completas de Buffon by Georges-Louis Leclerc Buffon (Comte de), Georges Cuvier (Barón), Bergnes y Cia (Barcelona) - 1841 - 255 pages
Observación de aves en Quito y sus alrededores by Juan Manuel Carrión - 2006 - 91 pages
Observations and experiments on causation of threat displays of the great tit (Parus major) by N. G. Blurton Jones - 1968 - 158 pages
Observations of the naturalhistory of the swallowtribe by Thomas Forster, Edward Forster - 1817 - 97 pages
Observations on the birds of Argentina, Paraguay, Uruguay, and Chile by Alexander Wetmore - 1926 - 448 pages
Occasional paper by Church Music Society - 1910
Occasional publication by Entomological Society of Nigeria - 1984
Occasional publication by Entomological Society of Nigeria - 1982
Occasional publication by Entomological Society of Nigeria - 1980
Occasional publication by Entomological Society of Nigeria - 1978
Occasional publication by Entomological Society of Nigeria - 1976
Occasional publication by Entomological Society of Nigeria - 1974
Occasional publication by University of the State of New York. Foreign Area Materials Center - 1970
Occasional publication by Entomological Society of Nigeria - 1968
October farm by William Brewster - 1936 - 285 pages
October farm by William Brewster - 1936 - 285 pages
OEuvres complètes de Buffon by Georges Louis Leclerc Buffon (comte de) - 1818
OEuvres complètes de Buffon by Georges Louis Leclerc Buffon (comte de) - 1818
Of feathers and colours by Indian Institute of Science, Bangalore - 1992 - 70 pages
Official checklist of the birds of Australia by Royal Australasian Ornithologists' Union. Checklist Committee, Harry Wolstenholme, Libraries Board of South Australia - 1926 - 212 pages
Official checklist of the birds of Australia (2d ed.) Supplements 1 to 9 by Royal Australasian Ornithologists' Union. Check List Committee - 1968 - 55 pages
Officials and organizations concerned with wild-life protection, 1933 - 1933 - 13 pages
Officials and organizations concerned with wild-life protection, 1933 - 1933 - 13 pages
Officials and organizations concerned with wildlife protection by U.S. Fish and Wildlife Service, William Frederick Bancroft, Talbott Denmead, Frank Leslie Earnshaw, Frank Granville Grimes, George Augustus Lawyer, Theodore Sherman Palmer - 1916
Officials and organizations concerned with wildlife protection by U.S. Fish and Wildlife Service, William Frederick Bancroft, Talbott Denmead, Frank Leslie Earnshaw, Frank Granville Grimes, George Augustus Lawyer, Theodore Sherman Palmer - 1914
Officials and organizations concerned with wildlife protection, 1934 - 1934 - 14 pages
Officials and organizations concerned with wildlife protection, 1937 by United States. Dept. of Agriculture - 1937 - 15 pages
Oil and related toxicant effects on waterfowl immune defenses by Tonie E. Rocke - 1982 - 106 pages
Oiseaux dans le temps by Ariane Coppens de Houthulst - 1954 - 137 pages
Oiseaux de paradis et colibris by Ernst Sutter - 1953 - 127 pages
Oiseaux du Parc national des Cévennes by Parc national des Cévennes (France) - 1983 - 84 pages
On a collection of birds made by Mr. W. Hoffmanns on the Rio Madeira, Brazil by Carl Eduard Hellmayr - 1907
On a new species of crown-pigeon by Otto Finsch - 1875 - 632 pages
On an undescribed species of the genus Phasianus by Benjamin Ledbeater - 1833 - 3 pages
On birds observed at the Dry Tortugas, Florida during parts of March and April, 1890 by William Earle Dodge Scott - 1890 - 14 pages
On birds observed in Amelia County, Virginia by Percy Evans Freke - 1881 - 32 pages
On Pristorhamphus versteri, a new genus and species of bird from the Arfak Mountains, New Guinea by Otto Finsch - 1875 - 642 pages
On safari by Abel Chapman - 1908 - 340 pages
On some birds and eggs collected by Mr. Geo. Comer at Gough Island, Kerguelen Island, and the Island of South Georgia by George Elliott Verrill, George Comer - 1895
On some hybrid ducks by Alfred Newton - 1860 - 4 pages
On some points in the anatomy of the steamer duck (Micropterus cinereus) by Robert Oliver Cunningham - 1872 - 9 pages
On some points in the anatomy of the Steamer Duck (Micropterus cinereus). by Robert Oliver Cunningham - 1871
On the birds of Shiocton in Bovina, Outagamie County, Wisconsin, 1881-83 by Frederik Lange Grundtvig - 1895 - 158 pages
On the edge by Tom Hutton - 2006 - 67 pages
On the evolution of inter and intra specific communication through natural and sexual selection by Torbjörn Järvi - 1983 - 52 pages
On the far side of the mountain - 1992 - 170 pages
On the freezing of the egg of the common fowl by John Davy - 1864 - 9 pages
On the habits and distribution of birds on the North Atlantic by Vero Copner Wynne-Edwards - 1935 - 114 pages
On the morphology of a reptilian bird, Opisthocomus cristatus by William Kitchen Parker - 1891
On the Natural History and Classification of Birds by William Swainson - 1836
On the Natural History and Classification of Birds: On the bibliography, nomenclature, and preservation of birds by William Swainson - 1836
On the nidification of the winter wren in Nova Scotia by Harry Piers - 1892 - 5 pages
On the probable origin of certain birds by William Earle Dodge Scott - 1905 - 12 pages
On the recent occurrence of certain rare birds in the vicinity of Portland, Maine by Nathan Clifford Brown - 1882 - 2 pages
On the warblers of Texas by Clifford Eugene Shackelford, Texas. Wildlife Division - 2000 - 16 pages
On the wings of a bird by Herbert Ravenel Sass - 1929 - 334 pages
Onderzoekingen over de veeren bij hoenderachtige vogels by Jan Herman Kruimel - 1916 - 97 pages
One plus one by Pamela Amber - 1987 - 32 pages
Ontario birds by Lester Lynne Snyder - 1951 - 248 pages
Ontario-St. Lawrence waterfowl investigation by New York (State) Bureau of Fish and Wildlife Investigations, Pittman-Robertson Project. New York (State) - 1948 - 284 pages
Oologia belgica by René Verheyen, Institut royal des sciences naturelles de Belgique - 1967 - 334 pages
Optimal migration by Thomas Alerstam, Anders Hedenström - 1998 - 300 pages
Optimum essential amino acid levels in a starting ration for turkey poults by Robert Eldredge Warnick - 1970 - 116 pages
Orcadian papers - 1905 - 160 pages
Oregon and Washington marine mammal and seabird surveys by John J. Brueggeman, Ecological Consulting, Inc, United States. Minerals Management Service. Pacific OCS Region - 1992
Organisation sociale chez les vertébrés by Société française pour l'étude du comportement animal. Colloque - 1987 - 222 pages
Organization of a tropical guild of nectivorous birds by Peter Feinsinger - 1974 - 326 pages
Oriental frills, their history, breeding and management by H. Seaton - 1912 - 104 pages
Orientation and position-finding by birds by Geoffrey Vernon Townsend Matthews - 1973 - 16 pages
Original poems for infant minds by June Taylor - 1861
Ornamental waterfowl by Alec Albert Johnson, William Hale Payn - 1957 - 96 pages
Ornis oder das Neueste und Wichtigste der Vögelkunde by Ludwig Brehm - 1824
Ornis vindobonensis by August Friedrich Marschall (graf von) - 1882 - 192 pages
Ornithologia Americana by American Art Association, Anderson Galleries (Firm) - 1923 - 113 pages
Ornithological gazetteer of Ecuador by Raymond A. Paynter, Melvin Alvah Traylor - 1977 - 151 pages
Ornithological nomenclature and nomenclatorial procedure by Claude Henry Baxter Grant - 1958 - 26 pages
Ornithological observations in Northeast Greenland by Hans Meltofte - 1975 - 72 pages
Ornithological observations in Southern Peary Land, North Greenland, 1973 by Hans Meltofte - 1976 - 57 pages
Ornithological references by Cornell University. Seminar in Ornithology - 1939 - 128 pages
Ornithological series by Field Columbian Museum, Field Museum of Natural History - 1917
Ornithological studies conducted in the area of the proposed gas pipeline route by L.G.L. Limited, Environmental Research Associates, William W. H. Gunn, Canadian Arctic Gas Study Limited, Alaskan Arctic Gas Study Company - 1975 - 329 pages
Ornithological studies conducted in the area of the proposed gas pipeline route by L.G.L. Limited, Environmental Research Associates, William W. H. Gunn, Canadian Arctic Gas Study Limited, Alaskan Arctic Gas Study Company - 1975 - 225 pages
Ornithological studies in the Mackenzie Valley, 1973 by L.G.L. Limited, Environmental Research Associates, William W. H. Gunn, Canadian Arctic Gas Study Limited, Alaskan Arctic Gas Study Company - 1974 - 295 pages
Ornithological winter surveys on the coast of Tanzania 1988-89 by Thomas Bregnballe - 1990 - 63 pages
Ornithologie du Dauphiné, ou, Description des oiseaux observés dans les départements de l'Isère, de la Drome, des Hautes-Alpes et les contrées voisines by Hippolyte Bouteille - 1843 - 774 pages
Ornithologie, ou Méthode contenant la division des oiseaux en ordres, sections, genres, especes & leurs variétés by Mathurin-Jacques Brisson - 1760 - 734 pages
Ornithologische Veröffentlichungen aus Thüringen by Willi Semmler - 1992 - 112 pages
Ornithology by Austin Loomer Rand - 1967 - 311 pages
Ornithology books in the Library of Trinity College, Hartford by Trinity College (Hartford, Conn.). College Library, Karen B. Clarke, Watkinson Library - 1991 - 51 pages
Ornithology books in the library of Trinity College, Hartford by Trinity College (Hartford, Conn.), Viola Breit, Karen B. Clarke - 1983 - 270 pages
Ornithology in the neotropics by Leslie R. Cooperband, American Ornithologists' Union. Committee on Conservation - 1985 - 93 pages
Ornithology laboratory notebook by Arthur Augustus Allen - 1947 - 256 pages
Ornithology laboratory notebook by Arthur Augustus Allen - 1936 - 200 pages
Ornithology of Sabah by Frederick Halsey Sheldon, Robert G. Moyle, Jody Kennard - 2001 - 285 pages
Ornitología de la península de Yucatán by Barbara MacKinnon Vda. de Montes - 1993 - 76 pages
Ornitološki atlas Slovenije by Iztok Geister, Društvo za opazovanje in proučevanje ptic Slovenije - 1995 - 287 pages
Ortho's All about Attracting Hummingbirds and Butterflies by Ortho - 2001 - 96 pages
Orzeł ginący by Jan Śmiełowski - 2000 - 36 pages
Osceola National Forest phosphate extraction and processing by U.S. Fish and Wildlife Service. Office of Biological Services, National Fish and Wildlife Laboratory (U.S.). Gainesville Field Station - 1978 - 414 pages
Osprey management area plan, Crane Prairie Reservoir by Hadley B. Roberts - 1969 - 20 pages
Ostrich bibliography by University of Pretoria. Veterinary Science Library - 2001 - 327 pages
Ostrich bibliography - 1993 - 318 pages
Ostrich examination by D. G. Black, University of Sydney. Post-Graduate Committee in Veterinary Science - 1994 - 38 pages
Ostrich farming by Michael Y. Hastings - 1991 - 94 pages
Our American game birds by Van Campen Heilner - 1941 - 178 pages
Our bird book by Sidney Rogerson - 1947 - 128 pages
Our bird friends and foes by William Atherton DuPuy - 1925 - 319 pages
Our British birds by George S. Duncan - 96 pages
Our common birds and how to know them by John Beveridge Grant - 1891 - 216 pages
Our common birds and how to know them by John Beveridge Grant - 1891 - 216 pages
Our common birds and how to know them by John Beveridge Grant - 1891 - 224 pages
Our dooryard friends by Sara V. Prueser, Fred High - 1915 - 204 pages
Our egg marketing job by Frank Edward Mussehl, Horace Clyde Filley - 1945 - 4 pages
Our fancy pigeons by George Ure - 1890 - 282 pages
Our fancy pigeons by George Ure - 1886 - 282 pages
Our feathered friends by Elizabeth Grinnell, Joseph Grinnell - 1898 - 144 pages
Our feathered game by Dwight Williams Huntington - 1904 - 396 pages
Our migrant shorebirds in southern South America by Alexander Wetmore - 1927 - 24 pages
Our native songsters by Anne Pratt, Society for Promoting Christian Knowledge (Great Britain). Committee of General Literature and Education - 1852 - 350 pages
Our own birds by William Lloyd Baily - 1889 - 255 pages
Our summer migrants by James Edmund Harting - 1875 - 336 pages
Our winterbirds by Ernest Ingersoll - 1877
Out on a limb by Roy Lukes - 1979 - 211 pages
Outline of object and plan of the Nebraska National Egg Laying Contest by University of Nebraska (Lincoln campus) Agricultural Experiment Station - 1920 - 3 pages
Outline of the Central Flyway waterfowl management plan by United States. Bureau of Sport Fisheries and Wildlife - 1958 - 94 pages
Outline of upland game bird management by University of Michigan. School of Natural Resources, Elizabeth Sherwood Browne Beard - 1951 - 286 pages
Ovarian follicles in reptiles and birds by Sardul S. Guraya - 1989 - 285 pages
Ovarian follicles in reptiles and birds by Sardul S. Guraya - 1989 - 285 pages
Oversight hearing on Arctic snow geese by United States. Congress. House. Committee on Resources. Subcommittee on Fisheries Conservation, Wildlife, and Oceans - 1998 - 60 pages
Owl by William Service - 1969 - 92 pages
Owls by Claus König, Friedhelm Weick, J. H. Becking - 1999 - 462 pages
Owls by day and night by Hamilton A. Tyler, Don Phillips - 1978 - 208 pages
Owls in folklore & natural history by Virginia C. Holmgren - 1988 - 175 pages
Owls of old forests of the world by Bruce G. Marcot, Pacific Northwest Research Station (Portland, Or.) - 1995 - 64 pages
Owls of the world by John A. Burton - 1992 - 208 pages
Owls of the world by Philip John Kennedy Burton - 1984 - 208 pages
Owls of the world - 1973 - 216 pages
Owned by an eagle by Gerald Summers - 1976 - 223 pages