Historical clue formulations

• Rich soil deposit — 2026-05-22
• Windblown soil — 2023-06-18
• Silty soil — 2023-06-04
• Porous soil — 2021-07-31
• Fertile soil — 2020-05-26
• Good earth — 2019-07-05
• Good earth — 2019-03-21
• Fertile soil — 2017-11-27
• Loamy soil — 2017-10-24
• Good earth — 2017-04-29
• Windblown soil — 2014-08-20
• Loamy soil — 2012-12-11
• Good earth — 2012-11-13
• Windblown soil — 2011-05-08
• Good earth — 2011-03-11
• Windblown soil — 2010-12-21
• Rich soil deposit — 2010-07-20
• Windblown soil — 2009-08-23
• Loamy soil — 2008-09-07
• Windblown deposit — 2007-12-27
• Windblown soil — 2006-02-20
• Silt deposit — 2004-08-10
• Wind-borne deposits — 2004-02-19
• Windblown soil — 2002-10-15
• Fertile soil — 2001-12-06
• Loamy deposit — 2001-11-06
• Loamy soil — 2001-09-04
• Windblown soil — 2001-07-10
• Gardener's soil — 2001-04-29
• Wind-borne soil — 2001-03-13
• Loamy deposit — 2000-11-24
• Windblown soil — 2000-07-11
• Windblown soil — 2000-06-22
• Fertile soil — 2000-02-28
• Windborne deposit — 1999-06-07
• Loamy deposit — 1999-04-08
• Mississippi Valley deposit — 1998-09-05
• Loamy soil deposit — 1997-12-24
• Loamy soil — 1995-09-28
• Loamy soil — 1994-11-28