Books in Browsing: Psychiatry/Psychology (sorted alphabetically)
- Nuovi studii sul genio vol. I (da Colombo a Manzoni) (Italian) Cesare Lombroso
- Nuovi studii sul genio vol. II (Origine e natura dei genii) (Italian) Cesare Lombroso
- Observations on Insanity John Haslam
- Observations on Madness and Melancholy John Haslam
- Occultism and Common-Sense Beckles Willson
- Of Genius', in The Occasional Paper, and Preface to The Creation Aaron Hill
- Of holy disobedience A. J. Muste
- Ojennusnuora (Finnish) Epictetus
- Old Crow Alice Brown
- omnipotent self, a study in self-deception and self-cure Paul Bousfield
- Om viljans frihet: Ett föredrag (Swedish) Frans von Schéele
- On Being Human Woodrow Wilson
- On Compromise John Morley
- On Sameness and Identity: A Psychological Study George Stuart Fullerton
- On Singing and Music Society of Friends
- Ontario Normal School Manuals: Science of Education Ontario. Department of Education
- On the Ethics of Naturalism W. R. Sorley
- On the Fourfold Root of the Principle of Sufficient Reason, and On the Will in Nature: Two Essays (revised edition) Arthur Schopenhauer
- On the Nature of Thought John Haslam
- On the Popular Judgment Immanuel Kant
- On the State of Lunacy and the Legal Provision for the Insane J. T. Arlidge
- Ontology, or the Theory of Being P. Coffey
- Op de Levensreis (Dutch) J. A. Cramer, P. J. Molenaar, W. L. Welter, Hendrik Anne Constantijn Snethlage, J. C. Schuller, A. J. A. Vermeer, J. H. Gerretsen, and Frank van Gheel-Gildemeester
- Optimism: An Essay Helen Keller
- Oraculo do Passado, do presente e do Futuro (1/7) (Portuguese) Bento Serrano