AMERICAN FIRST DAY COVER SOCIETY – www.virtualstampclub.com/afdcsappl.html

ART KOBER – http://www.artkober.com

JULIAN & SHARON PUGH CACHETS, INC. - www.julianpugh.com

AFDCS CLAUDE C. RIES CHAPTER - members/home.new/rieschapter

PHILATELIC LITERATURE & U.S. CLASSICS - www.jameslee.com

JAMES T. MCCUSKER - www.jamesmccusker.com

JJF'S PHILATELIC LINKS (great site!) - spacecovers.com/links/links_philatelics.htm