Related Clues:
- Dubbed period
- Long historical episode
- Long stretch of time
- About a billion years
- Unit in astronomy
- Abbr. on Topps cards
- ''Big Band'' period
- ___ of Good Feelings, 1817-25
- Mind-boggling time
- Prohibition __
- The Big Band __
- Million-millennia period
- Category in pitching's Triple Crown
- Historian's unit
- History stretch