Audit Bureau of Circulations (ABC)
900 N Meacham Rd
Schaumburg, IL  60173-4968

Phone (708) 605-0909
Fax (708) 605-0483
http://www.accessabc.com

Certified Audit of Circulations (CAC)
155 Willowbrook Blvd - 4th Floor
Wayne, New Jersey 07470

Phone  (973) 785-3000  
Fax  (973) 785-8341
http://www.certifiedaudit.com

Verified Audit Circulation (CAC)
900 Larksupr Landing Circle #295
Larkspur, CA  94937

Phone (415) 461-6006
Fax (415) 461-6007
Toll Free (800) 775 3322
http://www.verifiedaudit.com