United States Covers
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By Franking
- 1861-8 Issue (3)
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- 1900 to 1920 Commemoratives (31)
- 1902 Definitives (1533)
- 1920's Commemoratives (112)
- 1922 Fourth Bureaus (1426)
- 1930's Commemoratives (1557)
- 1940's Commemoratives (1271)
- 1954 Liberty (563)
- 19th Century Commemoratives (7)
- Airmail Issues (561)
- Americana Issue (102)
- Banknotes (235)
- Beacons (2)
- Early Airmail (6)
- Famous Americans (224)
- First Bureaus (444)
- Great Americans (47)
- Kansas Nebraska (1)
- Modern Definitives (2355)
- National Parks (63)
- Overrun Nations (16)
- Personal Computer Postage (31)
- Plate Number Coils (172)
- Prexies (1555)
- Prominent Americans (973)
- Transport Issue (462)
- Transportation Coils (19)
- United States Government Postal Cards (2784)
- United States Post 1950's Commemoratives (2591)
- United States Postal Stationary (4254)
- Vending and Affixing Machine Perforations (2)
- Washington Franklins (4497)
- Winged Globes (110)
- World's Fair (74)
By Usage
- Coast Guard (118)
- Event (20564)
- Fleet P.O. (497)
- Foreign Destinations (5296)
- Highway Post Offices (1727)
- Inaugural Cover (656)
- Locals (104)
- Machine Cancel (2859)
- Penalty (174)
- R.F.D. (26)
- Slogan Cancel (4063)
- Spray-On Cancel (119)
- U.S. A.P.O.'s (1353)
- U.S. Flag's (1673)
- U.S. Marine Corps (64)
- U.S. R.P.O.'s (1846)
- U.S. Ships (3961)
- United States First Day Cover (4995)
- Washington Bicentennial (264)
- Washington Bicentennial Event (962)
By State or Territory
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- Connecticut (1430)
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- District of Columbia (4964)
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- Kentucky (667)
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- U.S. Virgin Islands (81)
- Utah (490)
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- Washington (4930)
- West Virginia (679)
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