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Related Clues:
- Stamp-selling org.
- Bygone mail abbr.
- Org. with carriers
- Letters on some farm letters
- Where private messages are sent?: Abbr.
- Address for an overseas G.I.
- Letter delivery grp.
- Postmaster general's org.
- Priority mail grp.
- Org. that trademarked 'Pony Express' in 2006
- GI's mail drop
- Farm address abbr.
- Old postal abbr.
- Mil. address part
- Abbr. on a letter to a soldier