Historical clue formulations

• Mountain crest — 2025-01-27
• Where to take the high road? — 2024-11-08
• Raised strip — 2024-09-25
• Mountain spine — 2024-06-10
• Topographical map feature — 2021-06-26
• Top of a chain, maybe — 2020-01-11
• Feature of a forehead or fingerprint — 2018-11-08
• Hiker's climb — 2016-10-28
• Potato chip feature — 2015-10-21
• Klingon forehead feature — 2013-01-07
• Certain chip feature — 2011-11-18
• First secretary of homeland security — 2009-04-30
• Fingerprint feature — 2008-12-07
• First secretary of homeland security — 2008-01-08
• Chain of hills — 2007-05-21
• Fingerprint feature — 2006-08-06
• Fingerprint part — 2006-02-22
• Corrugation — 2004-10-17
• Chain of hills — 2004-01-06
• Watershed dividing line — 2001-04-18
• Part of a roof — 2001-02-20
• Blue ___ Mountains — 2000-05-15
• Chip feature — 2000-03-30
• Chip feature — 2000-01-29
• See 53-Across — 1997-08-03
• Chain of hills — 1997-07-28
• Chip feature — 1997-01-05
• Raised strip — 1996-09-27
• Mountain chain — 1996-08-06
• Fingerprint part — 1996-02-24
• Chain of hills — 1994-07-26
• Chain of hills — 1994-04-11