Historical clue formulations

• Pell-___ — 2010-05-04
• Cartoonist Lazarus — 2004-10-15
• Pell-___ — 2001-10-07
• Pell-___ — 1999-08-22
• Cartoonist Lazarus — 1997-04-04
• Pell-___ — 1996-04-07