The following links are people that have made significant contributions to my 1893 Columbian Expo collection as well as my US coin collection.

Kagin's - David McCarthy
Tiburon, CA
www.kagins.com

www.exonumia.com - Rich Hartzog
Rockford, IL
www.exonumia.com

The History Bank - Norm Bolotin
Woodinville, WA
1-877-585-8818
norm@thehistorybank.com

Harlan Berk - Tom DeLorey
Chicago, IL
www.harlanjberk.com

Old World Coin - Jerry and Carl
McHenry, IL
815-344-8800

Dick Osburn
Kemah, TX
www.dickosburn.com