Historical clue formulations

• Old-fashioned "That's absolutely the last time" — 2017-11-19
• Opposite of eternally — 2013-07-28
• Opposite of eternally — 2006-12-28
• Opposite of 58-Across — 2005-01-07
• Raven's remark — 1998-09-12
• Poe refrain — 1996-05-17
• 37-Across from a raven — 1995-12-07