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BookFinder4U is a free service that searches 55 bookstores, 40,000 booksellers worldwide and finds the lowest book prices. Two systems are included: an in-print book search system and an out-of-print book search system.
R. R. Bowker: Comprehensive database of worldwide English language book, audiobook, and video titles. Also contains books out of print, the full Publishers Authority Database, bestseller database (spanning over 100 years) and a database of author biographies.
Thomson Gale in association with the British Library: The aims of the ESTC are to provide a comprehensive bibliography of the printed output of the hand-press era, to list the whereabouts of surviving copies, and to note the existence of facsimiles. The holdings of over 2,000 libraries around the world are represented. It includes 1. All relevant items printed in the British Isles in any language; 2. All relevant items printed in Colonial America, the United States (1776-1800) and Canada; in any language; 3. All relevant items printed wholly or partly in English, or other British vernaculars, in any other part of the world. (Source: R. C. Alston and M. J. Jannetta. Bibliography, Machine Readable Cataloguing and the ESTC, London, the British Library, 1978, p.16).
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