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 classification of the British Palæozoic rocks / by the Rev. Adam Sedgwick ; With a systematic description of the British Palæozoic fossils in the Geological museum of the University of Cambridge, by Frederick McCoy - Salter, John William, 1820 -1869 (J.W. Parker and Son; [etc.], 1851)

A synopsis of the family Unionidae - Lea, Isaac, 1792 -1886 (H.C. Lea, 1870)

A synopsis of the family Unionidae - Lea, Isaac, 1792 -1886 (H. C. Lea, 1870)

Synopsis of the organic remains of the Cretaceous group of the United States. Illustrated by nineteen plates. To which is added an appendix, containing a tabular view of the Tertiary fossils hitherto discovered in North America - Morton, Samuel George, 1799 -1851 (Key & Biddle, 1834)

Synopsis of the parasites of domesticated mammals of Canada - Kennedy, Murray James, 1943 - (Alberta Agriculture, Animial Health Division, 1988)

Synopsis of the parasites of domesticated mammals of Canada - Alberta. Animal Health Division. (Alberta Agriculture, Animal Health Division, 1986)

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 reptilium : or short descriptions of the species of reptiles. Part I, Cataphracta. Tortoises, crocodiles, and enaliosaurians - Gray, John Edward 1800 -1875 (Treuttel, Wurtz, and Co, 1831)

Synopsis reptillium; or, Short descriptions of the species of reptiles - Gray, John Edward 1800 -1875 (Treuttel, Wurtz, and Co, 1831)

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

System der Urweltlichen pflanzenthiere durch diagnose : analyse und abbildung der geschlechter erläutert. Zum gebrauche bey vorlesungen über petrefactenkunde und zur erleichterung des selbststudiums derselben - Bronn, H. G. (Heinrich Georg), 1800 -1862 (In der academischen buchhandlung von J.C.B. Mohr, 1825)

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)

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

Systema naturæ in quo naturae regna tria, secundum classes, ordines, genera, species, systematice, proponuntur - Linné, Carl von, 1707 -1778 (Apud G. Kiesewetter, 1740)

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, 1770)

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)

Systema orbis vegetabilium : quod gratiosi medicorum ordinis consensu et auctoritate - Rudolphi, Friedrich Karl Ludwig, 1801 -1849 (Typis F.Guil. Kunike, 1830)

Systema plantarum Europae, exhibens characteres naturales generum, characteres essentiales generum & specierum, synonima antiquorum, phrases specificas recentiorum Halleri, Scopoli, &c. Descriptiones rariorum, nec-non floras tres novas, Lugdunaeam, Delphinalem, Lithuanicam, non omissis plantis exoticis in hortis Europae vulgo obviis - Linné, Carl von, 1707 -1778 (Sumptibus Piestre & Delamolliere, 1785)

Systema reptilium. Fasciculus primus, Amblyglossae - Fitzinger, Leopold Joseph, 1802 -1884 (Braumüller et Seidel, 1843)

Systema vegetabilium florae Peruvianae et Chilensis, : characteres prodromi genericos differentiales, specierum omnium differentias, durationem, loca natalia, tempus florendi, nomina vernacula, vires et usus nonnullis illustrationibus interspersis complectens - Pavón, José, 1754 -1840 (Typis Gabrielis de Sancha, 1798)

Systema vegetabilium florae Peruvianae et Chilensis :characteres prodromi genericos differentias ... - Pavón, José, 1754 -1840 (Typis Gabrielis de Sancha, 1798)

Systematic database of Musca names (Diptera) : a catalog of names associated with the genus-group name Musca Linnaeus, with information on their classification, distribution, and documentation - Thompson, F. Christian. (Koeltz Scientific Books, 1993)

Systematic revision of the Asian forest scorpions (Heterometrinae Simon, 1879), revised suprageneric classification of Scorpionidae Latreille, 1802, and revalidation of Rugodentidae Bastawade et al., 2005 - Prendini, Lorenzo (American Museum of Natural History, 2020)

Systematic revision of the sand scorpions, genus Buthacus Birula, 1908 (Buthidae C.L. Koch, 1837) of the Levant, with redescription of Buthacus arenicola (Simon, 1885) from Algeria and Tunisia - Prendini, Lorenzo (American Museum of Natural History, 2021)

Systematische phylogenie - Haeckel, Ernst, 1834 -1919 (Georg Reimer, 1894)

Systematisches Verzeichniss aller derjenigen Schriften welche die Naturgeschichte betreffen, von dem ältesten bis auf die neuesten Zeiten (J.C. Hendel, 1784)

Tabacologia :hoc est Tabaci, seu nicotianae descriptio medico-cheirurgico-pharmaceutica, vel, ejus praeparatio et usus in omnibus fermè corporis humani incõmodis - Blon. (Ex Officina Isaaci Elzeviri, 1626)

Tableau encyclopédique et méthodique des trois règnes de la nature. Contenant l'helminthologie, ou les vers infusoires, les vers intestins, les vers mollusques, &c - Bory de Saint-Vincent, M. (Jean Baptiste Geneviève Marcellin), 1778 -1846 (Panckoucke, 1791)

Tableau encyclopédique et méthodique des trois règnes de la nature : Vers, coquilles, mollusques et polypiers - Bory de Saint-Vincent, M. (Jean Baptiste Geneviève Marcellin), 1778 -1846 (Chez Mme. veuve Agasse, imprimeur-libraire, rue des Poitevins, no 6, 1827)