UACC
Universal Autograph Collectors Club
P.O. Box 6181
Washington, DC 20044-6181
http://www.uacc.org/

The Manuscript Society
350 N. Niagara Street
Burbank, CA 91505-3648
http://www.manuscript.org/

PADA
The Professional Dealers Association
P.O. Box 1729, Murray Hill Station
New York, NY 10156
(888)338-4338
http://www.padaweb.org