Historical clue formulations

• Characters in "There Will Be Blood" — 2025-07-17
• Some Texas tycoons — 2017-06-06
• J. Paul Getty and others — 2015-11-29
• Drill instructors? — 2012-09-19
• Well-connected industrialists? — 2012-06-03
• Ones with well-defined careers? — 2006-12-23
• Some Texas tycoons — 2004-08-23
• Rig owners — 2004-01-11
• Some Texan V.I.P.'s — 2001-11-04