Historical clue formulations

• Four-time Hugo Award winner Frederik — 2022-05-19
• Nebula Award winner Frederik — 2019-07-20
• Science fiction writer Frederik — 2012-06-06
• Science fiction author Frederik — 2012-03-11
• Sci-fi writer Frederik — 2011-08-13
• Science fiction writer Frederik — 2010-02-03
• "The Far Shore of Time" author Frederik — 2009-04-18
• Sci-fi writer Frederik — 2004-03-03
• Sci-fi author Frederik — 2003-11-28
• Sci-fi writer Frederic — 1999-07-11
• Sci-fi author Frederik — 1998-01-23
• Sci-fi writer Frederik — 1997-02-28