Wikipedia:Articles for deletion/The Rivers and Beacon-Hills of Gondor
per  #5, which says nothing about whether a work needs to be finished or published. It says that "the author's life and body of written work would be a common subject of academic study," which for Tolkien it obviously is. You can nitpick any individual source to death if you want to, but the deletion rationale is basically "there aren't any secondary sources discussing this work, except for..." and then that's followed by a list of all the secondary sources that discuss the work
— User:Toughpigs, 15:57, 20 April 2020 (UTC)
Stance: keep
Cited policy: WP:NBOOK (Wikipedia:Notability)