Worldwide Experts
Comprehensive list of worldwide philatelic experts

Professional Stamp Experts
Specializes in United States stamps, leading firm for grading

The Philatelic Foundation
Non-profit, specializes in United States stamps and covers and grading.


American Philatelic Society
Largest stamp collector's organization in the United States

American Stamp Dealer's Association
Main governing body for members of the stamp industry

Linn's Stamp News
Weekly Stamp Publication

Collector's Club of New York

Royal Philatelic Society of London
Oldest philatelic society in the world

Smithsonian National Postal Museum

The British Library
Preeminent British resource

Philatelic Bibliopole
Philatelic literature

James E. Lee
Philatelic literature

Philip Bansner
Philatelic literature