Scotts #323 US stamps
U.S. & Worldwide Stamps & Postal History - January 11-12, 2006
The John Larson Collection of Worldwide Postage Dues; U.S. & Worldwide Stamps - September 18-19, 2007
323 - 1904 1c Robert R. Livingston - Mystic Stamp Company
US Stamps Values Scott 324: 2c 1904 Louisiana Purchase Exposition
323-27 - Complete Set, 1904 Louisiana Purchase - Mystic Stamp Company
Spink Shreves Galleries Sale - 136 Page 12
Auction No 161 - Prestige Philately
323-27 - Complete Set, 1904 Louisiana Purchase - Mystic Stamp Company
Costs of US Stamp Scott Catalogue #323: 1c 1904 Louisiana Purchase Exposition
U.S. & Worldwide Stamps & Postal History - January 11-12, 2006
U.S. and Worldwide Stamps - January 23-24, 2002
US Stamp Prices Scott Cat. # 325 - 3c 1904 Louisiana Purchase Exposition