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Kane Books - Scholarly and antiquarian books.
www.kanebooks.com/

Kay's Secondhand Books & Used Sheet Music - Used non-fiction books and sheet music, listed in categories.
www.kaysmusic.com/

Kazoo Books - Used books including hard cover and paperback, featuring more recent titles rather than old and rare.
www.kazoobooks.com/

Keeble Antiques - Rare, antiquarian and out of print books, publishers end of line titles, deltiology, old photographs and antique maps. based in Dorset, UK.
www.keebleantbks.co.uk/

Kelmscott Bookshop - Collectible, out-of-print, and scholarly books as well as search, book binding and restoration services.
www.kelmscottbookshop.com/

Ken Lopez - Bookseller - Out-of-print and rare books, specializing in modern literary first editions.
www.lopezbooks.com/

Ken Sanders Rare Books - Specialities include Edward Abbey, Wallace Stegner, B. Traven, Utah and the Mormons, and Modern First editions.
www.ksb.com/

Ken Spelman Rare Books - Fine, rare, antiquarian, academic and out-of-print books. UK based, ships worldwide.
www.kenspelman.com/

Keogh's Books - Secondhand and antiquarian books. Search by author, title or keyword. Many out of print editions, specialising in arts and literature.
www.keoghsbooks.com

Kloof - Scholarly books from all times on the law, economics, history, philosophy and other sciences.
www.dekloof.com/

Kolumb Internet Bookstore - Used, rare, antiquarian and out-of-print books (including first editions) specialialties include the former USSR, Oriental languages, as well as art, ballet and illustrated books.
www.kolumb.com/

Krueger Books - Offers Rare, signed and first edition.
www.kruegerbooks.com/