Commercial bookfinding resources

AddAll Used and Out of Print Search
Meta search engine for used and out of print books. Covers i.a. Abebooks, Antiqbook, ILAB and ZVAB/Choosebooks.

Antiqbook
Searching the stock of more than 400, mainly European booksellers.

Boekenvondst.nl
Search engine especially effective for Dutch language books or books on the Netherlands. Provides names and addresses of most antiquarian booksellers in the Netherlands.

Bookfinder
Meta search engine for used and out of print books. Covers i.a. Abebooks, Amazon, Antiqbook, ILAB and ZVAB/Choosebooks.

Zentrales Verzeichnis Antiquarischer Bücher (ZVAB)
Large online antiquarian search engine specialized in, but not restricted to German language publications. ZVAB merged with Choosebooks, the originally English language marketplace.