Historical clue formulations

• One who won't take no for an answer regarding 38-Across — 2023-02-28
• Persistent character of children's lit — 2020-05-09
• Who asked "Would you eat them in a box? Would you eat them with a fox?" — 2019-05-01
• Green eggs and ham purveyor, in "Green Eggs and Ham" — 2013-05-20
• Persistent Seuss character — 2012-05-03
• Last words of "Green Eggs and Ham" — 2010-03-22
• Dr. Seuss character with a red hat — 2008-11-23
• "Do you like green eggs and ham?" speaker — 2007-10-02
• Dr. Seuss's green eggs and ham offerer — 2006-04-09
• Green eggs and ham profferer, in Dr. Seuss — 2005-01-26
• Dr. Seuss character — 2004-07-07
• Dr. Seuss character — 2001-05-25
• Dr. Seuss creation — 1999-05-29
• Seuss character — 1998-02-04
• Hater of green eggs and ham — 1997-11-16