ODNB: Oxford Dictionary of National Biography, ed. by H. C. G. Matthew and Brian Harrison, 60 vols, Oxford: Oxford University Press, 2004

[Ogg, —] 1826. Heat, Library of Useful Knowledge, London: Baldwin, Cradock, and Joy

Ogilby, John 1670. Africa: Being an Accurate Description of the Regions of Aegypt, Barbary, Lybia, and Billendulgerid, the Land of Negroes, Guinee, AEthiopia, and the Abyssines; with All the Adjacent Islands. Collected and Translated from Most Authentick Authors, London: printed for the author

Ólafsson, Eggert and Pálsson, Bjarni 1805. Travels in Iceland, Performed by Order of His Danish Majesty: Containing Observations on the Manners and Customs of the Inhabitants, a Description of the Lakes, Rivers, Glaciers, Hot-Springs, and Volcanoes, of the Various Kinds of Earths, Stones, Fossils, and Petrifactions, as Well as of the Animals, Insects, Fishes, &c, London: Richard Phillips

An Old Militia Surgeon [pseud.] [1861]. The Gastric Regions and Victualling Department. By an Old Militia Surgeon, London: Hardwicke

Oliver, Daniel 1864. Lessons in Elementary Botany, London and Cambridge: Macmillan & Co

Oliver, Daniel 1869. First Book of Indian Botany, London: Macmillan & Co

Olivier, Guillaume Antoine 1801. Travels in the Ottoman Empire, Egypt, and Persia: Undertaken by Order of the Government of France, During the First Six Years of the Republic, London: T. N. Longman & O. Rees, and T. Cadell Jun. and W. Davies

Oppenheim, Annie Isabella 1892. Phreno-Physiognomy: Scientific Character-Reading From the Face, London: Simpkin & Marshall

Oppenheim, Janet 1985. The Other World: Spiritualism and Psychical Research in England, 1850–1914, Cambridge: Cambridge University Press

Opsomer, Carmélia 2001. 'L'almanach de Mathieu Laensbergh et les savoirs médiévaux', Bulletin de la Société des Bibliophiles Liégeois, 24, 113–41

Ormsby, John 1876. Stray Papers, London: Smith, Elder and Co.

Otter, William 1824. The Life and Remains of the Rev. Edward Daniel Clarke, LL.D. Professor of Mineralogy in the University of Cambridge, London: George Cowie and Co.

Otto, Friedrich Julius 1857. A Manual of the Detection of Poisons by Medico-Chemical Analysis, trans. (with notes and additions) by William Elderhorst, New York; London: H. Bailliere

Otto, Friedrich Julius 1870. Anleitung zur Ausmittelung der Gifte: und zur Erkennung der Blutflecken bei gerichtlich-chemischen Untersuchungen, 4th edn, Braunschweig: Verlag von Friedrich Vieweg und Sohn

Owen, Richard 1855. 'On the Anthropoid Apes', Report of the Twenty-Fourth Meeting of the British Association for the Advancement of Science; Held at Liverpool in September 1854, Notices and Abstracts of Miscellaneous Contributions to the Sections, 111–13

Owen, Richard 1858–62. 'Summary of the Succession in Time and Geographical Distribution of Recent and Fossil Mammals', Proceedings of the Royal Institution of Great Britain, 3, 174–189

Owen, Richard 1859. 'Address', Report of the Twenty-Eighth Meeting of the British Association for the Advancement of Science; Held at Leeds in September 1858, xlvii–cx

Owen, Richard 1862. 'On Some Objects of Natural History from the Collection of M. Du Chaillu', Report of the Thirty-First Meeting of the British Association for the Advancement of Science; Held at Manchester in September 1861, Notes and Abstracts of Miscellaneous Communications to the Sections, 155–156

Owen, Robert Dale 1860. Footfalls on the Boundary of Another World: With Narrative Illustrations, Philadelphia: J. P. Lippincott & Co