Oakholm Books Specialty: General secondhand Aberfeldy, United Kingdom
Oak Knoll Books, ABAA, ILAB Specialty: Publishing, Typography, Printing, Bookbinding, Book Collecting, Book Illustration, History of the Book, Book Arts, Books about Books, Bibliography NEW CASTLE, DE, U.S.A.
Oakleigh Specialty: Classic, Journals, Magazin, Vintage, Computer Science and educational. London, United Kingdom
Oast Park Books Specialty: Political History, Church History, Social History, Economic History, Military Southend -on- Sea, ESSEX, United Kingdom
Obelisk Books of Stratford-upon-Avon Specialty: Politics and Espionage, China and South East Asia, Film and Theatre, Modern First Editions, Rare and Collectable Books Stratford upon Avon, United Kingdom
Oberle Specialty: Pädagogik /Psychologie, Alte Drucke, Zeitschriften, Literatur, Philosophie, Theologie, Kunst und Reisen, Naturwissenschaften und Medizin, Russland und Kommunismus, Geschichte Bad Münstereifel, Germany
Object Relations Specialty: Rare books on Art and Design, Psychology, Esoteric, Modern First Editions, Languages, Cinema, Photography, Philosophy, History, and Music London, United Kingdom
Oblivion Books Specialty: Modern Firsts and Fine Literature, Art, Architecture, and Design, Radical Literature, Philosophy and Critical Theory Seattle, WA, U.S.A.
O'Brien Books Specialty: Travel and exploration and much more, Art, History, Gaeilge Books, Nature, Archaeology, Books of Irish interest Wexford, WEX, Ireland
Observance of Hermits Specialty: Fiction, Mystery, Sci-fi,Fantasy,modern & classic in English & Russian, Nature, wildlife, general science, Religion/Sirituality, Psychology/Sexuality, History/ Politics, Poetry/ Philosophy/ Lit. Crit., Children and young adults, Art books, Old, rare, and collectible books, Alaskana, Juvenalia, Fritz Creek, AK, U.S.A.