PCGS Set Registry - The Overland Trail Collection Coin Album
Scotts #325 US stamps
Cost of US Stamp Scott Catalogue # 324 - 2c 1904 Louisiana Purchase Exposition
US Scott 324 2c Thomas Jefferson Louisiana Purchase Stamp MNG Unused No Gum G689
Stamps and Coins: Louisiana Has Been Honored on US Stamps for More Than 100 Years
The Louisiana Purchase Exposition and Medallic Souvenirs
Estate of the Union – Almost History
Louisiana Purchase Exposition Issue
World's fair philately: 19th and early 20th centuries
LOUISIANA PURCHASE