Historical clue formulations

• Bret Harte/Mark Twain collaboration — 2014-10-03
• Bret Harte/Mark Twain play — 2012-01-19
• Play co-authored by Mark Twain — 2007-06-24
• Mark Twain/Bret Harte play — 2006-09-24
• Bret Harte character — 1998-12-10
• Bret Harte character — 1994-12-12