Historical clue formulations

• Knot on a tree — 2015-11-08
• Bump on a log — 2015-06-19
• Wood knot — 2012-06-12
• Lumber feature — 2011-03-12
• Wood blemish — 2009-08-28
• Trunk protuberance — 2009-01-17
• Bump on a log — 2004-01-02
• Wood blemish — 2001-01-18
• Wood protuberance — 2000-12-05
• Tree trunk bulge — 1999-08-22
• Wood knot — 1995-05-31