New Edition The only comprehensive source for detailed information on nearly 23,000 nonprofit American membership organizations of national scope, the new 31st edition has approximately 500 newly added associations. Every entry offers a wealth of valuable data, typically including the organization's complete name, address and phone number together with the primary official's name and title; fax number, when available; founding date, purpose, activities and dues; national and international conferences; and more.

Also featured is an alphabetical name and keyword index so you can quickly locate the name and address of the organization you need to contact without ever having to consult the main entry. Encyclopedia of Associations has two companion volumes: Volume 2, Geographic and Executive Indexes and Volume 3, Supplement, which updates contact information for more than 2,500 entries from the previous edition and provide coverage of 500 new or newly identified associations.