Historical clue formulations

• Seuss title character — 2018-04-15
• Dr. Seuss title character — 2012-04-22
• Dr. Seuss title animal — 2010-05-23
• Dr. Seuss elephant — 2008-07-21
• Dr. Seuss's "___ Hears a Who" — 2007-03-19
• Egg-hatching elephant of children's lit — 1996-06-30