Vatican Philatelic Society - The first and oldest philatelic society in the United States dealing exclusively with stamps and related matters of the Vatican and Roman States
Joe Luft's Philatelic Resources on the Web - THE SOURCE for philatelic information on the internet.
Vatican City Philatelic and Numismatic Office
Linn's Stamp News - The largest weekly philatelic newspaper in the US
American Philatelic Society - The oldest philatelic society in the US
Subway Stamp Shop - The largest coin and stamp supply company in the World