Historical clue formulations

• With 70-Across, alternative title for "To Kill a Mockingbird"? — 2020-08-16
• "Ciao" — 2016-08-28
• "So long" — 2013-12-20
• "Ciao for now!" — 2011-11-08
• Example of 41-Across — 2007-07-18
• "So long" — 1999-03-17