Stamp Collecting Directory

Stamp Collecting Directory Listings: US Stamps

Museum of U.S. Essays & Proofs
Early U.S. postage and revenue stamp design.

Post Office in Paradise: Mail and Postage Stamps of Nineteenth Century Hawaii

Stamp Library - United States Stamps
Photos of US stamps.

The 1¢ Franklin Plating Archive

The Curtis Collection of U.S. Revenue Stamps

United States Postal Service® - Postal History

US Stamps
Pictorial and price guide.