The striped spermophiles or ground squirrels of Colorado. (Citellus tridecemlineatus pallidus and Citellus tridecemlineatus parvus.) - Burnett, William L. (1914)

The student's handbook of stratigraphical geology - Jukes-Browne, A. J. (Alfred John), 1851 -1914 (E. Stanford, 1912)

A student's text-book of zoology - Shipley, A. E. Sir, (Arthur Everett), 1861 -1927 (S. Sonnenschein and Co., ltd, 1905)

A student's text-book of zoology - Shipley, A. E. Sir, (Arthur Everett), 1861 -1927 (S. Sonnenschein and co, 1898)

A student's text-book of zoology - Shipley, A. E. Sir, (Arthur Everett), 1861 -1927 (S. Sonnenschein and Co., ltd, 1932)

Studies on acari; no. 1, the genus Demodex, Owen - British Museum (Natural History). Department of Zoology. (Printed by order of the Trustees of the British Museum, 1919)

Studies on Cenozoic vertebrates of western North America ... - Colbert, Edwin H. 1905 -2001 (Carnegie Institution of Washington, 1938)

Studies on Giardia microti - Boeck, William C. (William Charles), 1894 -1972 (University of California Press, 1919)

Studies on the structure & development of vertebrates - Goodrich, Edwin S. (Edwin Stephen), 1868 -1946 (Macmillan, 1930)

The study of animal life - Thomson, J. Arthur (John Arthur), 1861 -1933 (C. Scribner's sons, [printed at the Edinburgh press,], 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 two species of gulls, Larus Californicus and L. Delawarensis, breeding in an inland habitat - Vermeer, Kees (1967)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1975)

Stuttgarter Beiträge zur Naturkunde. Serie A, Biologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1989)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1985)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1991)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1994)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1995)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1996)

Stuttgarter Beiträge zur Naturkunde. Serie B, Geologie und Paläontologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1999)

Stuttgarter Beiträge zur Naturkunde. Serie A, Biologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 2013)

The sucking lice - Ferris, Gordon Floyd, 1893 -1958 (1951)

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 for Mountain Plover (Charadrius montanus) on Federal Lands in the Powder River Basin - United States. Bureau of Land Management. (University of Wyoming, Wyoming Natural Diversity Database, 2001)

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)

Die Süsswasserfauna Deutschlands. Eine Exkursionsfauna - Brauer, August, 1863 -1917 (G. Fischer, 1909)

Die Süsswasserfauna Deutschlands. Eine Exkursionsfauna - Brauer, August, 1863 -1917 (G. Fischer, 1911)

Die Süsswasserfauna Deutschlands. Eine Exkursionsfauna - Brauer, August, 1863 -1917 (G. Fischer, 1910)

Swan Valley northern bog lemming survey : Final report to Montana Department of Transportation - Montana. Dept. of Transportation. (Montana Natural Heritage Program, 1994)

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, 1980)

Sylvatic species of Echinococcus from rodent intermediate hosts in Asia and South America - Gardner, Scott Lyell, 1956 - (Museum of Texas Tech University, 2013)

A synopsis of the Amphibia of California - Storer, Tracy I. (Tracy Irwin), 1889 -1973 (University of California Press, 1925)

Synopsis of the Digenea of mammals of North America - Alberta. Animal Health Division. (Alberta Agriculture, Animal Health Division, 1988)

A synopsis of the mammals of North America and the adjacent seas - Elliot, Daniel Giraud, 1835 -1915 ([Field Columbia Museum], 1901)

Synopsis of the parasites of the vertebrates of Canada : helminths and protozoa of terrestrial mammals - Alberta. Animal Health Division. (Alberta Agriculture, Animal Health Division, 1986)

Synopsis of the parasites of vertebrates of Canada : ectoparasites of terrestrial mammals - Alberta. Animal Health Division. (Alberta Agriculture, Animal Health Division, 1986)

Synopsis of the weasels of North America - Merriam, C. Hart (Clinton Hart), 1855 -1942 (U.S. Dept. of Agriculture, Division of Ornithology and Mammalogy, 1896)

Synopsis of the weasels of North America - Merriam, C. Hart (Clinton Hart), 1855 -1942 (G.P.O, 1896)

System of ophthalmology - Duke-Elder, Stewart, Sir, 1898 -1978 (Mosby, 1958)

Systematic results of the study of North American land mammals during the years 1901 and 1902 - Miller, Gerrit S. Jr. (Gerrit Smith), 1869 -1956 (Society of Natural History, 1903)

Systematic results of the study of North American land mammals to the close of the year 1900 - Miller, Gerrit S. Jr. (Gerrit Smith), 1869 -1956 (Society of Natural History, 1901)