Historical clue formulations

• Eagle's nest: Var. — 2012-04-05
• Ethereal — 2011-06-16
• Ethereal — 2002-06-16
• Unsubstantial — 2001-08-10
• Unsubstantial — 2000-11-30
• Hawk's home: Var. — 1997-12-16
• Lofty, as a mountain peak — 1996-10-06