Historical clue formulations

• Huey, Dewey or Louie, to Donald Duck — 2017-08-16
• Dewey, to Donald — 2015-10-29
• Certain heir — 2006-08-24
• Huey, Dewey or Louie, notably — 2004-09-30
• Great-___ — 2001-11-10
• Huey, Dewey or Louie, to Donald Duck — 1998-10-19