(a treasure hunt) a book by Sean Kelly, Ted Mann

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I think PF is probably the only place equipped to do it.

I am confident I know where the key is in image 3. Everyone is looking in the wrong spot...lol
 
I've done some map comparison to imagery in Image 3 and I think I know where it might be BUT I need to figure out how to check a spot before digging. I could use a probe but are there any other techniques for finding disturbed ground without GPR?