United States Covers
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By Franking
- 1861-8 Issue (21)
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- Airmail Issues (516)
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- Banknotes (276)
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- Dual Usage (3)
- Early Airmail (1)
- Famous Americans (244)
- First Bureaus (435)
- Great Americans (44)
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- National Parks (60)
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- Personal Computer Postage (49)
- Plate Number Coils (159)
- Prexies (1469)
- Prominent Americans (932)
- Transport Issue (449)
- Transportation Coils (19)
- United States Government Postal Cards (2841)
- United States Post 1950's Commemoratives (2562)
- United States Postal Stationary (3923)
- Vending and Affixing Machine Perforations (1)
- Washington Franklins (4278)
- Winged Globes (113)
- World's Fair (53)
By Usage
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- Foreign Destinations (7077)
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- Locals (100)
- Machine Cancel (2709)
- Penalty (169)
- R.F.D. (23)
- Slogan Cancel (4734)
- Spray-On Cancel (123)
- U.S. A.P.O.'s (1310)
- U.S. Flag's (1776)
- U.S. Marine Corps (59)
- U.S. R.P.O.'s (1614)
- U.S. Ships (3988)
- United States First Day Cover (6005)
- Washington Bicentennial (260)
- Washington Bicentennial Event (888)
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