Related Clues:

• Work shift for some
• Periods of history
• Pieces of history
• Two-term presidents' terms, e.g.
• '___ of Our Lives'
• Intervals
• Federalist and Imperialist, for two
• Wingtip-to-wingtip dimensions
• Long lines on a timeline
• History chapters?
• Deadball and steroid, e.g.
• Units of time
• The Depression and the cold war, for two
• Geological time periods
• Elizabethan and Big Band