Historical clue formulations

• Harold ___, Manhattan Project scientist — 2021-04-09
• Manhattan Project scientist Harold ___ — 2018-12-21
• 1934 Chemistry Nobelist Harold — 2015-07-16
• Chemistry Nobelist Harold — 2001-11-18
• Manhattan Project scientist — 1999-11-25
• 1934 Chemistry Nobelist — 1998-05-30
• Chemistry Nobelist Harold — 1995-02-13
• Nobel chemist Harold — 1994-08-10
• 1934 chemistry Nobelist — 1993-12-22