United States Covers
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By Franking
- 1900 to 1920 Commemoratives (23)
- 1902 Definitives (1399)
- 1920's Commemoratives (93)
- 1922 Fourth Bureaus (1322)
- 1930's Commemoratives (1411)
- 1940's Commemoratives (1180)
- 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 (2552)
- National Parks (61)
- Personal Computer Postage (47)
- Plate Number Coils (156)
- Prexies (1463)
- Prominent Americans (911)
- Transport Issue (456)
- Transportation Coils (12)
- United States Government Postal Cards (3347)
- United States Post 1950's Commemoratives (2607)
- United States Postal Stationary (4364)
- Unused United States Government Postal Cards (61)
- Unused United States Postal Stationary (56)
- Washington Franklins (4143)
- Winged Globes (108)
- World's Fair (50)
By Usage
- Coast Guard (116)
- Event (18311)
- First Flight (4316)
- Fleet P.O. (555)
- Foreign Destinations (8490)
- Highway Post Offices (1621)
- Inaugural Cover (553)
- Locals (106)
- Machine Cancel (2659)
- National Air Mail Week (2)
- Penalty (149)
- R.F.D. (22)
- Seals and Labels (248)
- Slogan Cancel (6446)
- Spray-On Cancel (124)
- U.S. A.P.O.'s (1303)
- U.S. Flag's (1894)
- U.S. Marine Corps (57)
- U.S. R.P.O.'s (1493)
- U.S. Ships (4067)
- United States First Day Cover (6997)
- Washington Bicentennial (286)
- Washington Bicentennial Event (871)
By State or Territory
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- Arkansas (561)
- California (11055)
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- Guam (53)
- Hawaii (461)
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- Iowa (1727)
- Kansas (918)
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- Maryland (1867)
- Massachusetts (4237)
- Michigan (2330)
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- Tennessee (1137)
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- Washington (4802)
- West Virginia (700)
- Wisconsin (2017)
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