Historical clue formulations

• Hall-of-Fame jockey Earl — 2012-04-28
• Earl ___, 1930 Triple Crown-winning jockey — 2010-05-01
• Hall of Fame jockey Earl — 2004-02-06
• Jockey great Earl ___ — 2002-04-13
• 1930 Triple Crown jockey — 1999-06-27
• Horse racing Hall-of-Famer Earl — 1997-06-06