Rereading Ligotti's Teatro Grottesco. I really enjoyed Songs of a Dead Dreamer & Grimscribe by him as well. I love the section of him describing how he approaches writing horror, and how each 'level' elevates from the previous one. I Have a Special Plan for this World is great as well. Big fan, go back to his work often.
That being said, looking for some more non-fiction or historical fiction based on cyptids, cryptozoology, divinations, and the occult in general. I know this is fairly general, but I enjoy project Blue Book and various historical reports. I saw David Morehouse 'Psychic Warrior' recommended on this thread, think I will check that out. Works similar to this is sort of what I'm looking for. Any regional folklore would be appreciated as well.