Either stuff from 1950s and deteriorated to the point of creepy terror, legit awful stuff (long list of that bro), ancient ritual relics (whether from several centuries A.D. or up to the early 1900s), stuff from every major war in history...
We're in a historic area so stuff just makes it's way to thrift stores. I still wonder who would want all of those harmonica records I saw. Like yeah historic value and all but dang dude the entire stack?
Its just seems its easier for writers to get their hands on old books because a. They know where to get them b. We're book magnets and old books are the easiest to obtain
Until I played one of the Carmen games from 1995 with Lynn Thigpen, and I found a note left behind from one of her agents, I didn't realize that Carmen pays her people too Lol