Historical clue formulations

• Glacial ridges — 2018-02-25
• Glacial ridges — 2015-07-26
• Range ridges — 2013-11-08
• Craggy mountain ridges — 2010-08-09
• Glaciation products — 2010-07-30
• The Sierra Nevada Minarets, e.g. — 2009-08-22
• Features of the Sierras — 2009-07-14
• Mountain ridges — 2007-12-17
• Craggy mountain ridges — 2007-08-14
• Glacial ridges — 2006-09-17
• Products of glaciation — 2006-07-22
• Glacial formations — 2002-02-09
• Products of glaciation — 2000-01-13
• Rugged ridges — 1999-01-05
• Geological formations — 1995-10-28
• Mountain ridges — 1995-04-23
• Ridges — 1995-02-04
• Mountain ridges — 1994-11-08