Historical clue formulations

• Yucatán people of old — 2024-05-20
• Yucatán natives — 2020-09-13
• Early people who used a base-20 numerical system — 2018-07-07
• Mexican pyramid builders — 2015-05-27
• Ancient writers of hieroglyphics — 2006-03-03
• Early calendar developers — 2002-06-02
• Central American Indians — 2002-04-09
• Yucatán natives — 2000-12-12
• Central American Indians — 2000-05-22
• Noted pyramid builders — 2000-01-07
• Pioneers of a 365-day calendar — 2000-01-06
• Tikal dwellers — 1996-12-07
• Uxmal residents — 1995-06-29
• Yucatan people — 1994-08-15
• Pyramid builders — 1994-03-19