System der urweltlichen Konchylien : durch Diagnose, Analyse und Abbildung der Geschlechter erläutert - Bronn, H. G. (Heinrich Georg), 1800 -1862 (J.C.B. Mohr, 1824)

A system of geology with a theory of the earth : and an explanation of its connexion with the sacred records - Macculloch, John, 1773 -1835 (Longman, Rees, Orme, Brown, and Green, 1831)

Systematic arrangement of the figures - Gray, John Edward 1800 -1875 (Longman, Brown, Green and Longmans?, 1850?, 1850)

Systematic list of the Frederick E. Edwards collection of British oligocene and eocene Mollusca in the British Museum (Natural History), with references to the type-specimens from similar horizons contained in other collections belonging to the Geological Department of the Museum - British Museum (Natural History). Department of Geology. (Printed by order of the Trustees, 1891)

Systematic lists illustrative of the Flora, Fauna, Palaeontology, and Archaeology of the North of Ireland - Stewart, Samuel Alexander, 1826 -1910 (Printed for the Club, 1870)

Systematisches Conchylien-Cabinet - Kobelt, Wilhelm, 1840 -1916 (Bauer und Raspe, 1837)

Systematisches Conchylien-Cabinet - Kobelt, Wilhelm, 1840 -1916 (Bauer und Raspe, 1862)