Historical clue formulations

• Symbolic carving — 2022-10-10
• Hierarchical structure, metaphorically — 2017-09-28
• Heads of a Northwest tribe? — 2013-06-30
• Hierarchy — 2012-06-22
• Indian carving — 2008-10-28
• Headline? — 2007-01-31
• Indian post — 2003-11-18
• Hierarchy — 1998-12-05