Historical clue formulations

• "Because, after all, / A person's a person, no matter how small" — 2015-07-14
• 2008 film derived from Dr. Seuss — 2010-09-29
• Whence the line "A person's a person, no matter how small" — 2008-07-16
• Kids' book set in the jungle of Nool — 2004-11-12
• Book written by 38-Across — 2004-03-02
• Dr. Seuss title — 1994-05-10