United States Covers
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By Franking
- 1900 to 1920 Commemoratives (19)
- 1902 Definitives (1400)
- 1920's Commemoratives (89)
- 1922 Fourth Bureaus (1328)
- 1930's Commemoratives (1423)
- 1940's Commemoratives (1173)
- 1954 Liberty (525)
- Airmail Issues (508)
- Americana Issue (92)
- Banknotes (243)
- Beacons (13)
- Dual Usage (9)
- Famous Americans (215)
- First Bureaus (421)
- Great Americans (43)
- Kansas Nebraska (1)
- Modern Definitives (2624)
- National Parks (61)
- Overrun Nations (1)
- Personal Computer Postage (49)
- Plate Number Coils (140)
- Prexies (1456)
- Prominent Americans (912)
- Transport Issue (452)
- Transportation Coils (13)
- United States Government Postal Cards (3239)
- United States Post 1950's Commemoratives (2598)
- United States Postal Stationary (4177)
- Unused United States Government Postal Cards (47)
- Unused United States Postal Stationary (55)
- Washington Franklins (4132)
- Winged Globes (112)
- World's Fair (42)
By Usage
- Coast Guard (114)
- Event (18273)
- First Flight (4271)
- Fleet P.O. (519)
- Foreign Destinations (8432)
- Highway Post Offices (1624)
- Inaugural Cover (522)
- Locals (109)
- Machine Cancel (2623)
- Penalty (164)
- R.F.D. (22)
- Seals and Labels (235)
- Slogan Cancel (6213)
- Spray-On Cancel (126)
- U.S. A.P.O.'s (1275)
- U.S. Flag's (1838)
- U.S. Marine Corps (59)
- U.S. R.P.O.'s (1479)
- U.S. Ships (3966)
- United States First Day Cover (6960)
- Washington Bicentennial (282)
- Washington Bicentennial Event (873)
By State or Territory
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- California (10992)
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- Hawaii (468)
- Idaho (337)
- Illinois (5784)
- Indiana (1851)
- Iowa (1720)
- Kansas (924)
- Kentucky (786)
- Louisiana (900)
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- Maryland (1833)
- Massachusetts (4190)
- Michigan (2326)
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- Mississippi (549)
- Missouri (1889)
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- Puerto Rico (186)
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- South Dakota (468)
- Tennessee (1143)
- Texas (6872)
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- Washington (4757)
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- Wisconsin (1950)
- Wyoming (259)