Across
- 3. Underground system that shot mail through cities. Find a clue in Serving the Cities (Level 1).
- 5. First colonial mail route ran between these two cities. Find a clue in Networking the Nation (Level 1).
- 6. Famous postal mascot who rode the rails. Find a clue in the Atrium (Level 1).
- 7. Which was founded first: this mail service or the nation itself. clue in Gross Stamp Gallery (Level 2).
- 8. First U.S. stamp chosen by public vote. Find a clue in Gross Stamp Gallery (Level 2).
Down
- 1. special U.S. stamp sold at a higher price to support a cause. clue in Gross Stamp Gallery (Level 2).
- 2. What did USPS use the message "don't tie up the mail" and Mr. Zip to introduce? Find a clue in Systems at Work (Level 1).
- 4. initials of the two founding fathers on the first US stamps. Find a clue in Gross Stamp Gallery (Level 2).
- 7. Oldest federal law enforcement agency. Find a clue in USPIS (Level 1).