Historical clue formulations

• Seed coat — 2009-08-23
• Seed's exterior — 2007-09-15
• Seed's exterior — 2005-02-24
• Outer part of a seed — 2003-10-04
• Seed covering — 2001-02-18
• Seed coat — 1999-08-04
• Seed coating — 1999-05-29
• Head, in Italy — 1996-11-26
• Seed covering — 1995-10-06
• Seed cover — 1995-08-15
• Seed coat — 1994-10-29
• Seed cover — 1994-10-12
• Seed cover — 1994-05-29