UFO enthusiast vanishes, leaving behind a room full of coded writings
Category: Disappearances
How 1,600 People Went Missing from US Public Lands Without a Trace
https://www.outsideonline.com/2164446/leave-no-trace
http://www.unsilentmajoritynews.com/how-do-1100-people-vanish-in-u-s-national-parks-without-any-publicity/