Historical clue formulations

• The Rosetta Stone is one — 2014-07-30
• Inscribed stone slab — 2014-01-14
• Inscribed pillar — 2012-09-04
• Inscribed pillar — 2011-04-18
• Inscribed pillar — 2009-07-21
• Inscribed pillar — 2006-02-28
• Marked pillar — 2005-07-10
• Inscribed pillar — 1999-12-13
• Carved pillar — 1998-10-18
• Commemorative pillar — 1998-04-26
• Inscribed pillar — 1997-04-25
• Grave marker — 1997-02-16
• Inscribed column — 1997-01-28
• Burial stone — 1995-09-30
• Easter Island head, e.g. — 1994-09-11
• Inscribed pillar — 1994-01-15