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)

Synopsis filicum; or, A synopsis of all known ferns, including the Osmundaceae, Schizaeaceae, Marattiaceae, and Ophioglossaceae (chiefly derived from the Kew herbarium) Accompanied by figures representing the essential characters of each genus - Baker, John Gilbert, 1834 -1920 (R. Hardwicke, 1874)

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 birds of Australia, and the adjacent islands - Gould, John 1804 -1881 (Published by the author, 1837)

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

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

Synopsis of the contents of Gesner's Museum of Natural History at Saint John, N.B. opened on the fifth day of April, 1842 - Gesner's Museum of Natural History. (s.n.], 1842)

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, Angel Court, Skinner Street, 1840)

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

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall and Son, 1824)

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, 1835)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, 1832)

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, Angel Court, Skinner Street, 1836)

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 ([the Museum], 1823)

Synopsis of the contents of the British Museum - British Museum ([The Museum], 1827)

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

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

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall and Son, 1826)

Synopsis of the parasites of vertebrates of Canada : nematodes of birds - Kennedy, Murray James, 1943 - (Alberta Agriculture, Animal Health Division, 1990)

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)

System der Myriapoden, mit den Verzeichnissen und Berichtigungen zu Deutschlands Crustaceen, Myriapoden, und Arachniden - Koch, C. L. (Carl Ludwig), 1778 -1857 (Pustet, 1847)

System der Ornithologie Westafrica's - Hartlaub, Gustav, 1814 -1900 (C. Schünemann, 1857)

A System of natural history : containing scientifci [sic] and popular descriptions of man, quadrupeds, birds, fishes, reptiles and insects - Cuvier, Georges, baron, 1769 -1832 (Carter, Hendee, & Co, 1834)

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

Systema avium - Wagler, Johann Georg, 1800 -1832 (sumtibus J.G. Cottae, 1827)

Systema avium Australasianarum = A systematic list of the birds of the Australasian region - American Ornithologists' Union. (British Ornithologists' Union, 1927)

Systema Eleutheratorum : secundum ordines, genera, species, : adiectis synonymis, locis, observationibus, descriptionibus - Fabricius, Johann Christian, 1745 -1808 (Impensis Bibliopolii Academici novi, 1801)

Systema helminthum / auctore Carolo Mauritio Diesing ... Sumptibus Academiae caesareae scientiarum - Diesing, Karl Moritz, 1800 -1867 (W. Braumüller, 1851)

Systema naturae per regna tria naturae : secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis - Linné, Carl von, 1707 -1778 (Typis Ioannis Thomae, 1767)

Systema naturae, per regna tria naturae : secundum classes, ordines, genera, species cum characteribus, differentiis, synonymis, locis - Linné, Carl von, 1707 -1778 (Typis Ioannis Thomae, 1767)

Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis - Linné, Carl von, 1707 -1778 (Typis Ioannis Thomae von Trattner, 1767)

Systema natvræ per regna tria natvræ : secvndum classes, ordines, genera, species, cvm characteribus, differentiis, synonymis, locis - Gmelin, Johann Friedrich, 1748 -1804 (Typis Academicis, 1793)

Systema natvrae per regni tria natvrae secvndvm classes, ordines, genera, species, cvm characteribvs, differentiis, synonymis, locis - Linné, Carl von, 1707 -1778 (Io. Iac. Cvrt, 1760)

A systematic catalogue of British vertebrate animals - Jenyns, Leonard, 1800 -1893 (Printed by W. Metcalfe, for J. & J.J. Deighton, and T. Stevenson, and Longman, London, 1835)

Systematic catalogue of the eggs of British birds - Malan, S. C. (John van Voorst, 1848)

A systematic catalogue of the flowering plants and ferns indigenous to or growing wild in Ceylon - Trimen, Henry, 1843 -1896 (G. J. A. Skeen, 1885)

Systematic notes on Palearctic birds No. 17 Laniidae - Vaurie, Charles (American Museum of Natural History, 1955)

Systematische Aufzählung der Vögel Würtembergs, mit Angabe ihrer Aufenthaltsörter und ihrer Strichzeit - Landbek, Chr. Lu. (1834)

Systematische übersicht der Vögel Bayerns mit Rucksicht auf das örtliche und quantitative Vorkommen der Vögel, ihre Lebensweise, ihren zug und ihre Abänderungen - Blasius, Rudolf, 1842 -1907 (Kommissionsverlag von R. Oldenbourg, 1891)

Systematische Übersicht der Vögel Nord-Ost-Afrika's : mit Einschluss der arabischen Küste des rothen Meeres und der Nil-Quellen-Länder südwärts bis zum 4. Grade nördl. Breite - Heuglin, Theodor von, 1824 -1876 (K. Akademie der Wissenschaften, 1856)

Systematische Uebersicht der Thiere Brasiliens : welche während einer Reise durch die Provinzen von Rio de Janeiro und Minas geraës gesammlt oder beobachtet Wurden - Burmeister, Hermann, 1807 -1892 (G. Reimer, 1856)