A study of the incubation periods of birds; what determines their lengths - Bergtold, W. H. (William Harry), 1865 -1956 (The Kendrick-Bellamy co, 1917)

A study of the life history and ecology of the round-tailed muskrat (Neofiber alleni True) in North Central Florida - Birkenholz, Dale Eugene, 1931 - (1962)

A study of the structure of feathers, with reference to their taxonomic significance - Chandler, Asa C. (Asa Crawford), 1891 -1958 (University of California press, 1916)

A study of two species of gulls, Larus Californicus and L. Delawarensis, breeding in an inland habitat - Vermeer, Kees (1967)

Stuttgarter Beiträge zur Naturkunde - Staatliches Museum für Naturkunde in Stuttgart (Das Museum, 1968)

Summer birds of Flathead Lake - Silloway, Perley Milton (University of Montana, 1901)

Summer birds of the Chiricahua Mountains, Arizona - Tanner, James T. (James Taylor) (American Museum of Natural History, 1958)

Sunshine and sport in Florida and the West Indies - Aflalo, Frederick G. (Frederick George), 1870 -1918 (G. W. Jacobs & co, 1907)

Sunshine and sport in Florida and the West Indies - Aflalo, Frederick G. (Frederick George), 1870 -1918 (T. Werner Laurie, 1907)

Supplement to checklist of the vertebrate fauna of San Dimas Experimental Forest - Wright, John T. (California Forest and Range Experiment Station, 1953)

Supplement to the birds of Essex County, Massachusetts - Townsend, Charles Wendell, 1859 -1934 (The Club, 1920)

Supplement to the code of nomenclature and check-list of North American birds. 1-17 - American Ornithologists' Union. (The Union, 1908)

Supplement to the General synopsis of birds - Latham, John, 1740 -1837 (Printed for Leigh & Sotheby, 1787)

Sur l'classification de oiseaux depuis linné : discours pronouncé à la seance publique de la classe des sciences le 16 décembre 1879 - Sélys-Longchamps, Michel-Edmond, baron de, 1813 -1900 (F. Hayez, 1879)

A survey and record of Woolwich and West Kent containing descriptions and records, brought up-to-date, of geology, botany, zoology, archaeology and industries of the district, with a brief photographic commentary, in commemoration of the 12th Annual Congress, 1907, of the South Eastern Union of Scientific Societies - Grinling, C. H. (Labour Representation Print. Co, 1909)

Survey protocol for the great gray owl within the range of the Northwest Forest Plan - United States. Bureau of Land Management. (U.S. Dept. of Agriculture, Forest Service, 2004)

Svenska foglarna - Åkerlund, Peter, 1835 -1871 (Tryckt hos J. & A. Riis, 1856)

Svenska foglarna - Åkerlund, Peter, 1835 -1871 (Tryckt hos J. & A. Riis, 1886)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1978)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1981)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1983)

Symbolism of the Huichol Indians. By Carl Lumholtz - Lumholtz, Carl, 1851 -1922 (1900)

Synonomik der europäischen Brutvögel und Gäste : systematisches Verzeichniss nebst Angaben über die geographische Verbreitung der Arten unter besonderer Berücksichtigung der Brutverhältnisse - Rey, Eugène, 1838 -1909 (G. Schwetschke'scher Verlag, 1872)

Synopsis avium : nouveau manuel d'ornithologie - Dubois, Alphonse, 1839 -1921. (H. Lamertin, 1904)

Synopsis faunae Scandinaviae. Tom. 1. Pars 2, Aves - Billberg, Gustaf Johan, 1772 -1844 (Ex officina typogr. Caroli Deleen, 1828)

A synopsis of natural history: embracing the natural history of animals, with human and general animal physiology, botany, vegetable physiology and geology - Wyatt, Thomas, A. M. (T. Wardle, 1839)

A synopsis of the Accipitres (diurnal birds of prey) : comprising species and subspecies described up to 1920, with their characters and distribution - Gray, George Robert, 1808 -1872 (Priv. print. for the author, 1921)

A synopsis of the Accipitres (diurnal birds of prey) : comprising species and subspecies described up to 1920, with their characters and distribution - Swann, H. Kirke (Harry Kirke), 1871 -1926 (Wheldon & Wesley, 1922)

A synopsis of the Accipitres (diurnal birds of prey) : comprising species and subspecies described up to 1920, with their characters and distribution - Swann, H. Kirke (Harry Kirke), 1871 -1926 (Wheldon & Wesley, 1921)

A synopsis of the birds of North America - Audubon, John James, 1785 -1851 (Adam and Charles Black, 1839)

Synopsis of the birds of Vancouver Island - Brown, Robert, 1842 -1895 (s.n, 1868)

Synopsis of the classification of the animal kingdom - Nicholson, Henry Alleyne, 1844 -1899 (W. Blackwood, 1882)

Synopsis of the contents of the British Museum - British Museum (Woodfall, 1842)

Synopsis of the contents of the British Museum - British Museum (printed by Woodfall, 1837)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, 1838)

Synopsis of the contents of the British Museum - British Museum (printed by G. Woodfall, 1839)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, Angel Court, Skinner Street, 1836)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall and Son, Angel Court, Skinner Street, 1840)

Synopsis of the contents of the British Museum - British Museum (printed by G. Woodfall, 1838)

Synopsis of the contents of the British Museum - British Museum (Woodfall, 1841)

Synopsis of the families and genera of North American Diptera exclusive of the genera of the Nematocera and Muscidæ, with bibliography and new species, 1878-88 - Williston, Samuel W. (Samuel Wendell), 1851 -1918 (J.T. Hathaway, 1888)

Synopsis of the families and genera of North American Diptera, exclusive of the genera of the Nematocera and Muscidae, with bibliography and new species, 1878-88 - Williston, Samuel W. (Samuel Wendell), 1851 -1918 (J.T. Hathaway, 1888)

A synoptic text-book of zoölogy, for colleges and schools - Weysse, Arthur Wisswald, 1867 - (Macmillan, 1904)

A synoptical catalogue of British birds; intended to identify the species mentioned by different names in several catalogues already extant. Forming a book of reference to Observations on British ornithology - Forster, T. (Thomas), 1789 -1860 (Printed by and for Nichols, son, and Bentley, 1817)

Synoptical flora of North America: the Gamopetalæ, being a second edition of vol. I, part II, and vol. II, part I, collected - Gray, Asa, 1810 -1888 (Iverson, Blakeman, Taylor, and Company, 1886)

A synoptical list of the Accipitres (diurnal birds of prey) : comprising species and subspecies, described up to 1919, with their characters and distribution - Swann, H. Kirke (Harry Kirke), 1871 -1926 (J. Wheldon, 1920)

A synoptical list of the Accipitres (diurnal birds of prey) : comprising species and subspecies, described up to 1919, with their characters and distribution - Swann, H. Kirke (Harry Kirke), 1871 -1926 (J. Wheldon, 1919)