Historical clue formulations

• Winter lift — 2015-10-21
• Help in getting up — 2007-08-03
• Way to the top of a mountain — 2004-10-04
• One way to the top? — 2004-01-08
• Way to get to the top — 2001-01-18
• Aspen feature — 1998-12-12
• Ride up the mountain — 1996-07-17