United States Covers
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By Franking
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- Transport Issue (458)
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- United States Government Postal Cards (2694)
- United States Post 1950's Commemoratives (2421)
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- Washington Franklins (4562)
- Winged Globes (109)
- World's Fair (66)
By Usage
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- Penalty (176)
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- Slogan Cancel (3534)
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- U.S. A.P.O.'s (1359)
- U.S. Flag's (1606)
- U.S. Marine Corps (59)
- U.S. R.P.O.'s (1841)
- U.S. Ships (3819)
- United States First Day Cover (4526)
- Washington Bicentennial (225)
- Washington Bicentennial Event (970)
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