http://www.clark.net/pub/rmharris/booknet1.html
ABAA Booknet is a resource for people interested in old, rare books. It includes an infopage for the ABAA (Antiquarian Booksellers' Association of America) and links to newsletters, a list of booksellers, a search form for specific books and authors, information about book fairs, research and discussion groups, and a Book Security bulletin.