Historical clue formulations

• Brother Joe, Kevin or Nick of pop — 2025-08-02
• Nick, Joe or Kevin of pop — 2024-01-05
• ___ Brothers (pop trio) — 2021-04-10
• Polio vaccine developer Salk — 2020-02-25
• "Martin Chuzzlewit" villain — 2014-05-02
• Pop's ___ Brothers — 2010-10-12
• Pop's ___ Brothers — 2009-04-19
• ___ Brothers (pop trio) — 2008-08-07
• Villain in "Martin Chuzzlewit" — 2008-02-10
• Virologist Salk — 2003-07-03
• Dr. Salk — 2002-02-19
• Microbiologist Salk — 2001-01-22
• Bacteriologist Salk — 1999-08-08
• Angola's Savimbi — 1998-11-14