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O and I Books
Second-hand bookstore. Specializing in English and Spanish rare, hard to find antique 1876-1997 books.
Oak Knoll Books
Specialists in Books About Books; out-of-print books about book collecting, book history and the book arts; publisher, distributor, and bookseller.
Oasis Used and Antiquarian Book Search
Buys and sells all type of fine used books, scholarly, history, technical, art, science, and fiction.
Observer's Swap Shop
Swap site for Observer's Pocket Series books published by Frederik Warne from 1937 to 1982. Membership required for full service.
Observermart
Specialises in Observer's Pocket Books published in the UK by Frederick Warne.
Old Book Company
Books, in all subjects, available through a search engine.
Old Books
A general antiquarian shop with as first printings of literature and children's books, 19th and early 20th century scientific and other periodicals.
Old Catalogs and Books
Catalogs from the 1800s to 1970s, out of print engineering and medical books, machinery manuals, and company literature.
Old Paper World
Rare books, magazines, newspapers, ephemera; a broad cross section of rarities in many fields.
OldBookShop.Com
Used, out of print, and rare hardback books.
Olde South Books
Used and rare books, including medical, genealogy, fiction, biography, and religion.
Olof Edlund
Antiquarian and rare books and manuscripts in all fields.
On the Shelf
Buys, sells and trade used books in all genres. Includes comic books, collectibles, series and first editions.
Over-Sands Books.
Varied stock of antiquarian, second-hand, and out-of-print books for sale. The Shop is situated at Grange-over-Sands, UK.
Owl at the Bridge
Scholarly, rare and unusual out-of-print books. Primary interests are Italian history and culture and American industrial silver.