This is gonna kinda like I'm running a trail in the dark, I gave all my treasure books to a Chaplain for his library in Afghanistan except for two, one is which Gale R. Rhodes Waybill To Lost Spanish Mines And Treasures / Dream Garden Press / 1982, signed by my son in crayon once when I forgot and left it on the coffee table when he was about 2 years old. Before that I used books by I think they were the Pennington's from NM. What I have in mind is talking about Diamonds, crosses and anything that's got 3 or 4 directions carved on rocks, layed out with stones, six X six inch deep trenches, some stand for degree's but the ones that I am interested in is distance, the directions for the most part will be shown corner to corner and will be the West , North, East, and South. The distance may be 1/2 diamond ( triangle 3 directions ) 1/2 league, full diamond 1 league, diamond inside a diamond 1 and 1/2 league, 2 leagues 2 diamonds connected,These diamonds can and are sometimes chipped out around drill holes. Allways watch for the chipped out around all carvings, sometimes you have to invert color to see them, Thom showed me that trick, Obsolete Spanish and Portuguese units of measurements are very helpfull also