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Related Clues:
- Divisions of geological time
- Studied times
- Momentous time periods
- Victorian and Tudor, e.g
- They may match presidential administrations
- Geological eras
- Regency and Victorian, for two
- Periods of note, in history books
- Times-table entries
- Periods often tied to presidents
- Ballpark figs.?
- Times? European, and impetuous for the most part
- Momentous stretches
- Periods sometimes named for presidents
- Like, forever