United States Covers
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By Franking
- 1900 to 1920 Commemoratives (18)
- 1902 Definitives (1396)
- 1920's Commemoratives (84)
- 1922 Fourth Bureaus (1318)
- 1930's Commemoratives (1405)
- 1940's Commemoratives (1175)
- 1954 Liberty (522)
- Airmail Issues (496)
- Americana Issue (79)
- Banknotes (267)
- Beacons (15)
- Dual Usage (8)
- Errors Freaks and Oddities (7)
- Famous Americans (222)
- First Bureaus (424)
- Great Americans (39)
- Kansas Nebraska (1)
- Modern Definitives (2894)
- National Parks (60)
- Personal Computer Postage (47)
- Plate Number Coils (297)
- Prexies (1457)
- Prominent Americans (911)
- Transport Issue (453)
- Transportation Coils (12)
- United States Government Postal Cards (2980)
- United States Post 1950's Commemoratives (2608)
- United States Postal Stationary (4303)
- Unused United States Government Postal Cards (58)
- Unused United States Postal Stationary (56)
- Washington Franklins (4131)
- Winged Globes (105)
- World's Fair (42)
By Usage
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- Event (18124)
- First Flight (4017)
- Fleet P.O. (523)
- Foreign Destinations (8479)
- Highway Post Offices (1618)
- Inaugural Cover (537)
- Locals (105)
- Machine Cancel (2648)
- Penalty (149)
- R.F.D. (22)
- Seals and Labels (245)
- Slogan Cancel (6427)
- Spray-On Cancel (123)
- U.S. A.P.O.'s (1256)
- U.S. Flag's (1885)
- U.S. Marine Corps (57)
- U.S. R.P.O.'s (1480)
- U.S. Ships (3987)
- United States First Day Cover (6812)
- Washington Bicentennial (288)
- Washington Bicentennial Event (847)
By State or Territory
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- Indiana (1851)
- Iowa (1708)
- Kansas (915)
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- Washington (4780)
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- Wisconsin (1971)
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