I’m trying to locate a book called Early Spanish Treasure Signs and Symbols, by William Mahan, published in 1966.
East Wenatchee, Washington
The book is still around but seldom seen. I called several old-book, out-of-print book dealers and they didn’t have it but suggested you call some dealers in your area. Hard to find books come and go in these stores and you have to keep calling. You might also want to search the Internet.