Historical clue formulations

• Mount ___, highest peak in the Rockies — 2026-07-26
• Mount ___, highest peak in the Rockies — 2018-09-25
• Second-highest mountain in the lower 48 states — 2007-06-10
• Mount ___, highest peak in the Rockies — 2004-05-29
• Writer Hubbard / Grow threefold — 1998-07-20