Historical clue formulations

• Unit of firewood — 2021-12-18
• Cubic meter — 2018-10-02
• One cubic meter — 2016-10-31
• Cubic meter — 2015-07-07
• Firewood unit — 2015-06-26
• - — 2013-08-25
• About 264 gallons — 2012-09-15
• 1,000 liters — 2012-07-07
• Volume unit — 2012-04-22
• Firewood measure — 2010-11-13
• Firewood unit — 2009-05-31
• Volume unit — 2009-03-26
• Cubic meter — 2008-11-19
• Cubic meter — 2008-06-16
• Metric volume measure — 2008-05-28
• Cubic meter — 2008-04-27
• Wood measure — 2007-12-30
• Cordwood measure — 2007-06-06
• Metric measure — 2006-03-05
• One meter x one meter x one meter — 2005-02-13
• About a quarter of a cord — 2004-03-05
• Metric volume — 2004-01-07
• About 35.3 cubic feet — 2003-06-19
• Cordwood measure — 2001-03-13
• Cordwood measure — 2000-09-01
• Cubic meter — 2000-02-22
• Firewood measure — 2000-02-06
• Metric volume — 1999-03-23
• About 1/4 cord — 1999-02-19
• About 1.3 cubic yards — 1999-01-16
• About 1.3 cubic yards — 1998-11-06
• Cubic meter — 1998-09-13
• Cordwood measure — 1998-07-12
• Cubic meter — 1998-04-26
• Cubic meter — 1997-10-09
• Metric unit — 1997-04-09
• Unit of cordwood — 1996-10-18
• Cubic meter — 1996-06-25
• Cubic meter — 1996-04-08
• Cubic meter — 1995-07-05
• Metric measure — 1995-04-28
• 1,000 liters — 1995-03-31
• Cubic meter — 1994-10-26
• Metric measure — 1994-06-15
• Cordwood measure — 1993-12-21