Libriantichi  
   European book source linking to book searches. Multilingual
   http://www.libriantichi.com/

Louis Collins Books  
   Specializing in scholarly out-of-print books, especially anthropology of the world.
   http://www.collinsbooks.com/

Librairie Minet Frères  
   dealers of early printed and rare books with a preference for the Ancien Regime (in French and English).
   http://www.anticbooks.com/

Lynge and Søn  
   Antiquarian booksellers; Browse by subject or search by keyword.
   http://www.lynge.com/

Lymelight Books & Prints.  
   Antiquarian and secondhand books; specialities are art, geology, illustrated, literature, natural history, poetry, Topography and travel. Large general stock.
   http://www.lymelight-books.demon.co.uk/

Lucky Dog Books  
   Online request service for used hardbacks, paperbacks, LPs, cassettes, CDs, and videos.
   http://www.luckydogbooks.com/

LB BK Store  
   Offers stock available in conventional set prices and auction format.
   http://www.lbbk.com/

Loganberry Books  
   Used and rare books, specializing in children's and women's titles. Include a book identification service.
   http://www.logan.com/loganberry/

Liber Antiquus  
   Selection of early printed books, covering a broad range of topics and disciplines.
   http://www.liberantiquus.com/

Longaeva Antique Books and Collectibles  
   Used, rare and out of print books and print engravings from 17th to 20th century. Search service.
   http://www.longaeva.com/

LincBook  
   Rare, used, out-of-print books, pamphlets and ephemera.
   http://www.lincbook.com/

Lion and Phoenix Books  
   Rare, used, and out-of-print books; specializing in paperbacks and digests, first editions.
   http://www.lpbooks.com/

Librairie Hatchuel  
   French antiquarian books on history of ideas, politics, economics, social sciences, and philosophy.
   http://www.hatchuel.com/main.php?lg=2&dev=1

LaPointe's Used Books  
   Used books on a searchable website.
   http://www.lapointesbooks.com/

Last on Earth Books  
   Common and rare used books.
   http://www.nexicom.net/~lastonearth/

Lotsabooks Book Sellers  
   Used, out-of-print and rare books.
   http://www.lotsabooks.co.nz/

Little Stour Books  
   On-line catalogue of fine rare books
   http://www.littlestourbooks.com/index.shtml

La Pluma Blanca  
   Used and out of print books.
   http://asamee.bizland.com/

Lemuria Books  
   Signed first editions, stock includes Southern writers, Civil War, and children's books.
   http://www.lemuriabooks.com/

Librairie Sourget  
   Illuminated books, manuscripts, horae, incunabula, literature, bindings and works from 15th to 19th century.
   http://www.librairie-sourget.com

LughnassadhBooks.com  
   New, used, and out-of-print books.
   http://www.lughnassadhbooks.com/