| http://www.w3.org/ns/prov#value | - BookFinder is likely the most used of the meta searchers, searching 64 sites, including all of the majors - four versions of Abebooks, five of Amazon, Alibris, Barnes and Noble, Half, Biblio, Choosebooks, plus many smaller sites, non-U.S. sites, the member sites ILAB, IOBA and Tom Folio, and some individual stores.
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