Historical clue formulations

• Titular professor in a Nabokov novel — 2018-03-23
• Nabokov novel — 2017-09-27
• Nabokov novel — 2015-07-10
• Nabokov novel after "Lolita" — 2014-07-24
• Nabokov novel — 2010-11-27
• Vladimir Nabokov novel — 2010-08-15
• Nabokov novel — 2007-02-03
• Nabokov novel — 2006-12-16
• 1957 Nabokov novel — 2006-02-15
• Title professor in a 1957 novel — 2005-11-26
• Nabokov novel — 2004-06-17
• Nabokov novel — 2002-10-27
• 1957 Nabokov novel — 1997-03-23
• Nabokov novel — 1997-02-13
• Nabokov book, 1957 — 1995-01-22
• Nabokov novel — 1994-11-01