Historical clue formulations

• Sequel title ender — 2025-06-17
• Sequel title ender — 2020-03-25
• Sequel — 2018-07-27
• Sequel — 2017-03-17
• Work after the first? — 2013-03-15
• Sequel — 2012-09-16
• Trilogy's midsection — 2012-01-11
• Sequel — 1996-07-17