Historical clue formulations

• River running "down to a sunless sea," in "Kubla Khan" — 2018-06-15
• Xanadu's river — 2013-04-13
• "Kubla Khan" river — 2012-05-13
• Xanadu river — 2010-11-21
• Coleridge's sacred river — 2010-09-28
• River in "Kubla Khan" — 2010-08-08
• Fictional river of verse — 2008-06-06
• "Kubla Khan" river — 2006-07-16
• Coleridge's "sacred river" — 1996-01-21