Organizations and Dealers
AMERICAN AIR MAIL SOCIETY
AMERICAN PHILATELIC SOCIETY
AMERICAN REVENUE ASSOCIATION
AMERICAN TOPICAL ASSOCIATION
AMERICAN ASSOCIATION OF PHILATELIC EXHIBITORS
ARMED FORCES STAMP EXCHANGE CLUB
BRITISH NORTH AMERICA PHILATELIC SOCIETY
BRITISH CARIBBEAN PHILATELIC STUDY GROUP
GERMAN PHILATELIC SOCIETY
LINNS
NORTHWEST FEDERATION OF STAMP CLUBS
NATIONAL POSTAL MUESUEM
PRECANCEL STAMP SOCIETY
POSTAL HISTORY SOCIETY OF CANADA
REVENUE COLLECTOR
STAMP AUCTION NETWORK
STAMP COLLECTING FORUM
THE PERFINS CLUB
THE ROYAL PHILATELIC SOCIETY OF CANADA
TEXAS POSTAL HISTORY SOCIETY
UNITED STATES PHILATELIC CLASSICS SOCIETY
UNITED STATES STANTIONERY SOCIETY
UNITED STATES STAMP SOCIETY