Sexual dimorphism in the animal kingdom, a theory of the evolution of secondary sexual characters - Cunningham, J. T. (Joseph Thomas), 1859 -1935 (Black, 1900)

Skadelige insekter i vore haver - Boas, J. E. V. (Johan Erik Vesti), 1855 -1935 (C. J. Catos bog- & stentrykkeri, 1906)

Skandinaviens inseckter : en handbok i entomologi, till allmänna läroverkens tjenst - Thomson, C. G. (Carl Gustav), 1824 -1899 (Malmström & Komp's Boktryckeri, 1885)

Sketches of the natural history of Ceylon : with narratives and anecdotes illustrative of the habits and instincts of the mammalia, birds, reptiles, fishes, insects, &c. : including a monograph of the elephant and a description of the modes of capturing and training it with engravings from original drawings - Tennent, James Emerson, Sir, 1804 -1869 (Longman, Green, Longman, and Roberts, 1861)

Sketches of the natural history of Ceylon : with narratives and anecdotes illustrative of the habits and instincts of the mammalia, birds, reptiles, fishes, insects, etc. including a monograph of the elephant ... - Tennent, James Emerson, Sir, 1804 -1869 (Longman, Green, Reader, and Dyer, 1868)

Sketches of the natural history of Ceylon : with narratives and anecdotes illustrative of the habits and instincts of the mammalia, birds, reptiles, fishes, insects, &c. : including a monograph of the elephant and a description of the modes of capturing and training it : with engravings from original drawings - Tennent, James Emerson, Sir, 1804 -1869 (Longman, Green, Longman, and Roberts, 1861)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1858)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1862)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1869)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1873)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1878)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1881)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1882)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1905)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1940)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1942)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1951)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1953)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1956)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1961)

Smithsonian miscellaneous collections - Smithsonian Institution (Smithsonian Institution, 1965)

Spanische Dipteren - Strobl, Gabriel, 1846 -1925 (s.n, 1906)

Special scientific report. Wildlife - U.S. Fish; Wildlife Service (The Service, 1950)

Special scientific report. Wildlife - U.S. Fish; Wildlife Service (The Service, 1969)

Species taxa of North American birds; a contribution to comparative systematics - Mayr, Ernst, 1904 -2005 (The Club, 1970)

Die stämme der wirbeltiere - Abel, Othenio, 1875 -1946 (W. de Gruyter, 1919)

The standard natural history - Kingsley, J. S. (John Sterling), 1854 -1929 (S.E. Cassino and company, 1885)

The structure and classification of birds - Beddard, Frank E. (Frank Evers), 1858 -1925 (Longmans, Green, and co, 1898)

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

Stuttgarter Beiträge zur Naturkunde. Serie A, Biologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 1973)

Stuttgarter Beiträge zur Naturkunde. Serie A, Biologie - Staatliches Museum für Naturkunde in Stuttgart. (Staatliches Museum für Naturkunde, 2017)

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

A systematic catalogue of British insects : being an attempt to arrange all the hitherto discovered indigenous insects in accordance with their natural affinities. Containing also the references to every English writer on entomology, and to the principal foreign authors. With all the published British genera to the present time - Stephens, James Francis, 1792 -1853 (Baldwin and Cradock, 1829)

A systematic catalogue of British insects : being an attempt to arrange all the hitherto discovered indigenous insects in accordance with their natural affinities - Stephens, James Francis, 1792 -1853 (Baldwin and Cradock, 1829)

Systematic notes on the bird family Cracidae. No. 2, Relationships and geographical variation of Ortalis vetula, Ortalis poliocephala, and Ortalis leucogastra - Vaurie, Charles (American Museum of Natural History, 1965)

Systematic notes on the bird family Cracidae. No. 3, Ortalis guttata, Ortalis superciliaris, and Ortalis motmot - Vaurie, Charles (American Museum of Natural History, 1965)

Systematic notes on the bird family Cracidae. No. 10, The genera Mitu and Pauxi and the generic relationships of the Cracini - Vaurie, Charles (American Museum of Natural History, 1967)

Systematic notes on the bird family Cracidae. No. 4, Ortalis garrula and Ortalis ruficauda - Vaurie, Charles (American Museum of Natural History, 1965)

Systematic notes on the bird family Cracidae. No. 8, The genera Aburria, Chamaepetes, and Penelopina - Vaurie, Charles (American Museum of Natural History, 1967)

Systematic notes on the bird family Cracidae. No. 6, Reviews of nine species of Penelope - Vaurie, Charles (American Museum of Natural History, 1966)

Systematische Beschreibung der bekannten europäischen zweiflügeligen Insekten - Loew, H. (Hermann), 1807 -1879 (F. W. Forstmann, 1818)

Systematische Beschreibung der bekannten europäischen zweiflugeligen Insekten - Meigen, Johann Wilhelm, 1764 -1845 (s.n, 1826)

Systematische Beschreibung der bekannten europäischen zweiflugeligen Insekten - Meigen, Johann Wilhelm, 1764 -1845 (s.n, 1830)

Systematische Beschreibung der bekannten europäischen zweiflugeligen Insekten - Meigen, Johann Wilhelm, 1764 -1845 (s.n, 1838)