Historical clue formulations

• Refer (to) — 2023-05-04
• Refer (to) — 2018-01-26
• Indirectly refer (to) — 2015-04-21
• Refer (to) — 2011-05-09
• Refer (to) — 2011-03-20
• Refer — 2009-06-28
• Drive at, with "to" — 2007-03-16
• Refer — 2004-06-04
• Touch upon, with "to" — 2001-01-06
• Refer — 2000-12-09
• Refer obliquely — 1996-11-23
• Refer — 1996-07-13
• Refer (to) — 1994-01-24