Historical clue formulations

• River that once marked the boundary of the Wild West — 2025-05-24
• River through Santa Fe National Forest — 2025-05-16
• ___ Bill, folk hero who is said to have ridden a tornado like a bucking bronco — 2024-12-29
• Bill originating in Texas — 2024-03-15
• Cowboy Bill — 2024-02-16
• River through Carlsbad, N.M. — 2020-02-01
• Tributary of the Rio Grande — 2019-02-28
• River to the Rio Grande — 2018-07-27
• Bill of Southwest legend — 2017-07-27
• River mentioned in Yosemite Sam's self-introduction — 2016-02-04
• Red Bluff Dam's river — 2008-11-14
• Legendary cowboy ___ Bill — 2008-07-29
• River to the Rio Grande — 2005-07-10
• River to the Rio Grande — 2002-02-12
• New Mexico's ___ National Historical Park — 1999-05-05
• Bill of legend — 1999-04-28
• River to the Rio Grande — 1999-01-04
• River to the Rio Grande — 1996-12-05
• Legendary cowboy ___ Bill — 1996-10-16