Historical clue formulations

• Ask — 2020-04-21
• Ask — 2015-02-15
• "Who?," e.g. — 2011-07-14
• Ask (about) — 2005-06-19
• Author's letter to an editor — 2003-04-16
• Seek information from — 2002-03-31
• Express doubt about — 1999-11-07