In my youth I read a lot of science fiction, finding paperbacks in used bookstores. Isaac Asimov, Robert Heinlein, Ursula K. Leguin, Joe Haldeman to name a few. Recently I was looking through my collection of sci fi books and I came across this one - Cache From Outer Space . Its a double paperback by Phillip Jose Farmer. If memory serves, the stories were not so hot but the artwork is a hoot. Plus the name screamed for a cache to be placed.
FTF prize is a copy of the book.
Midlothian Mines Park is a nice place for a walk, open dawn till dusk. Parking available close by. Lots of muggles around so use stealth