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Related Clues:
- Swing and Big Band
- Long and distinct periods of history
- Bullpen numbers
- Key times
- Long periods, geologically
- Long geologic stretches
- Ballpark figs
- Times remembered
- Topics for history courses
- Paleozoic and others
- Major spans
- Historians' concerns
- Endless periods
- Time to evolve?
- Elizabethan and Victorian, for two