Historical clue formulations

• "The Tale of ___ Puddle-Duck" (Beatrix Potter children's book) — 2020-07-12
• Commercial aunt since 1889 — 2018-08-12
• Aunt known for her pancakes — 2010-03-23
• Aunt ___ — 2006-04-28
• Beatrix Potter's Puddle-Duck — 1999-02-27