O and I Books
Second-hand bookstore. Specializing in English and Spanish rare, hard to find antique 1876-1997 books.
url: www.oibooks.com/home.html
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.
url: www.oakknoll.com/
Oasis Used and Antiquarian Book Search
Buys and sells all type of fine used books, scholarly, history, technical, art, science, and fiction.
url: www.bookreader.org/
Observermart
Specialises in Observer's Pocket Books published in the UK by Frederick Warne.
url: www.observermart.co.uk/
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.
url: www.observers-books.co.uk/
Old Book Company
Books, in all subjects, available through a search engine.
url: www.oldbook.co.uk/
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.
url: www.oldbooks.net/
Old Catalogs and Books
Catalogs from the 1800s to 1970s, out of print engineering and medical books, machinery manuals, and company literature.
url: www.oldcatalog.com/
Old Paper World
Rare books, magazines, newspapers, ephemera; a broad cross section of rarities in many fields.
url: www.conknet.com/~oldpaperwrld/
OldBookShop.Com
Used, out of print, and rare hardback books.
url: www.oldbookshop.com/
Olde South Books
Used and rare books, including medical, genealogy, fiction, biography, and religion.
url: www.oldesouth.net/
Olof Edlund
Antiquarian and rare books and manuscripts in all fields.
url: www.edlund-books.com/
On the Shelf
Buys, sells and trade used books in all genres. Includes comic books, collectibles, series and first editions.
url: www.ontheshelfbooks.com/
One Book Worm
Rare, out-of-print, and secondhand books.
url: www.onebookworm.com/
Out Uv Print
Bookseller of rare, used, out of print literature.
url: www.geocities.com/more_8/
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.
url: www.oversandsbooks.co.uk/
Owl at the Bridge
Scholarly, rare and unusual out-of-print books. Primary interests are Italian history and culture and American industrial silver.
url: www.owlbridge.com/
