Antiqbook
The Netherlands Antiquarian Booksellers' Network provides a collection of online catalogues, searchable databases, mailing lists, and information for book collectors and sellers.
http://www.antiqbook.com/

Antiquarian Booksellers Association
Trade association for UK dealers in antiquarian and rare books and related areas.
http://www.aba.org.uk/

Antiquarian Booksellers Association of America
Organization of professional antiquarian booksellers.
http://abaa.org/

Antiquarian Booksellers' Association of Canada
Includes alphabetical, subject and geographical directories of members with links to online dealers.
http://www.abac.org/

Danish Antiquarian Booksellers Association
Den Danske Antikvarboghandlerforening; Directory of members with their specialities.
http://www.antikvar.dk/

Fearless Antiquarians
A directory of online antiquarian bookstores.
http://www.fearlessbooks.com/Antiquarians.html

Georgia Antiquarian Booksellers Association
Directory of antiquarian booksellers in Georgia with an online database of rare books, fine prints, and collectables.
http://www.gaba.net/

Global Book Town
A directory of independent bookstores in Australia, Canada, United Kingdom and United States. Categorized by subject, name, or location.
http://www.globalbooktown.com/

Independent Online Booksellers Association
International association of independent booksellers, promoting high standards and buyer protection.
http://www.ioba.org/

International Antiquarian Mapsellers Association
Trade association promoting the professional trade in antiquarian, collectible maps, atlases, charts and related books. Includes membership directory, dealers' catalogs, and stolen map reports.
http://www.antiquemapdealers.com/

International League of Antiquarian Booksellers
Encompasses national associations of antiquarian booksellers. Twenty-one nations and two thousand booksellers in membership.
http://www.ilab-lila.com/

Maine Antiquarian Booksellers Association
Group of about 80 members dealing in a range of used, rare and out-of-print books, maps, prints, autographs, bindings, photographs and ephemera. News, book fairs, members list, inventory search, and book theft news.
http://www.mainebooksellers.org/

New Hampshire Antiquarian Booksellers Association
Unofficial home page. Member directory with hours, locations, stock, and links; location map, and contact information.
http://www.nhaba.org/

Swedish Antiquarian Booksellers' Association
Membership directory, news, book fairs and other events.
http://www.svaf.se

Swiss Association of Antiquarian Book Sellers
Association of Swiss antiquarian book and print dealers, with membership directory, catalogs and news.
http://www.vebuku.ch/

Vermont Antiquarian Booksellers Association
An organization of booksellers from the state of Vermont.
http://members.valley.net/~vaba/