- 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.
- Ashworthbooks.com
- Provides an online forum for requesting search for out-of-print, rare, and antiquarian books.
- Books By ISBN
- Search online for books by ISBN and cross-linked by names of authors.
- Booksearch-at-hay.com
- Second hand, used, and antiquarian book search specialist serving book dealers and enthusiasts.
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