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AbeBooks.com
Online guide to old, rare, or out-of-print books. Features a search engine.
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Abooksearch.com
Facilitates searching for old, rare, and out-of-print books from booksellers and bookstores around the world. Search by author or book title.
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Ashworthbooks.com
Provides an online forum for requesting search for out-of-print, rare, and antiquarian books.
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Biblion.co.uk
Source for second hand and out of print books, rare books, magazines, journals and used textbooks.
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Booksearch-at-hay.com
Second hand, used, and antiquarian book search specialist serving book dealers and enthusiasts.
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TomFolio.com
International cooperative of independent dealers offering used and rare books, periodicals, and paper ephemera.