Start with high-confidence haunted places & mysteries books, then narrow by subgenre or adjacent topics.
Paranormal State
Ryan Buell, Stefan Petrucha
The Paranormal Ranger
Stanley Milford Jr.
The Dark Side of the Supernatural, Revised and Expanded Edition
Bill Myers, David Wimbish
Somebody Is Walking on Your Grave
Mariana Enriquez, Megan McDowell
Atlas of Paranormal Places
Evelyn Hollow
Ghosts and Legends of Charleston, South Carolina
Denise Roffe
All the Living and the Dead
Hayley Campbell, Macmillan Audio
Weird New England
Joseph A. Citro, Mark Moran
Tales From the Haunted South
Tiya Miles
Tales of the Troubled Dead
Catherine Belsey
The Ghost Lab
Matthew Hongoltz-Hetling
Atlas of Unidentified Flying Objects
Andy McGrillen
Lonely Planet Hidden Libraries
DC Helmuth, Nancy Pearl
Mountain Ghost Stories and Curious Tales of Western North Carolina
Randy Russell, Janet Barnett