United States Covers
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By Franking
- 1900 to 1920 Commemoratives (20)
- 1902 Definitives (1399)
- 1920's Commemoratives (84)
- 1922 Fourth Bureaus (1321)
- 1930's Commemoratives (1411)
- 1940's Commemoratives (1179)
- 1954 Liberty (522)
- Airmail Issues (498)
- Americana Issue (79)
- Banknotes (266)
- Beacons (15)
- Dual Usage (8)
- Errors Freaks and Oddities (4)
- Famous Americans (222)
- First Bureaus (424)
- Great Americans (39)
- Kansas Nebraska (1)
- Modern Definitives (2551)
- National Parks (61)
- Personal Computer Postage (47)
- Plate Number Coils (156)
- Prexies (1462)
- Prominent Americans (911)
- Transport Issue (456)
- Transportation Coils (12)
- United States Government Postal Cards (3341)
- United States Post 1950's Commemoratives (2603)
- United States Postal Stationary (4290)
- Unused United States Government Postal Cards (54)
- Unused United States Postal Stationary (53)
- Washington Franklins (4143)
- Winged Globes (108)
- World's Fair (43)
By Usage
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- Fleet P.O. (529)
- Foreign Destinations (8455)
- Highway Post Offices (1620)
- Inaugural Cover (539)
- Locals (104)
- Machine Cancel (2656)
- Penalty (149)
- R.F.D. (22)
- Seals and Labels (244)
- Slogan Cancel (6428)
- Spray-On Cancel (123)
- U.S. A.P.O.'s (1259)
- U.S. Flag's (1891)
- U.S. Marine Corps (57)
- U.S. R.P.O.'s (1492)
- U.S. Ships (4036)
- United States First Day Cover (6931)
- Washington Bicentennial (286)
- Washington Bicentennial Event (871)
By State or Territory
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- Iowa (1726)
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