Hey Rebel,
We would all love to see that. Unfortunately there is as many different interpretations of every sign. and I have some that I have never seen published. One common thread for all signs would be the way to go.
But there is also a thought by most THers I have met, that says you should work for the knowledge and apply what you learn. Most of us old guys never had the pleasure of a book to get our signs from, I know I have built my own as time went by I have rewritten it three or four times. Always adding new things and updating others, my kids called it "Dad's personal Indiana Jones book".
Some of us had the pleasure of knowing someone who had at one time a direct link to the trails themselves, and knew what the signs really meant.
For me it was an old guy named Curtis (78 years old when I met him at 16 years old myself) His Grandfather was part of a group of Indians who were at on point enslaved by the Spanish and was also part of the bunch that drove them out. He taught me a lot. I have a partner I am teaching. In the last 6 months We have added a good sign to the collection and others are on the cooker.
This stuff is important to history and shouldn't pass with out being handed down.
My suggestion is to get proficient with what you have out there and become the go to guy. out here the trees I have that are marked are axe hewn stumps mostly with a branch left on to point the way. and small stone pointers along the way between the stumps. sometimes a very large rock is propped up by a piece of wood but more often another stone. We don't have a lot of big trees around here that are anywhere big enough to cut a sign into.
As far as people who do know signs... there are a few here who are the best I have ever heard of.
Mesa Buddy is here,
Stilldigin is here,
Twisted fork is here.
These guys are awesome at reading and interpreting the messages left behind.
Stilldigin and twisted fork seem to know their way around the owlhoot signs as well and will help for the asking.
Happy Hunting,
Old Dog
"Google" TREASURE HUNTER'S UNIVERSITY - HAWKEYE... 
We know the native people (MOSTLY Cherokee) let the Spanish know where SILVER MINES were... we know the Spanish miners were looking for GOLD, and made the Cherokee "work" the SILVER mines in Georgia, South Carolina, possibly in North Carolina, Tennessee, and South West Virginia; MAYBE even West Virginia, and Kentucky. From "Cherokee" signs/maps to Spanish/Jesuit signs/maps; from Pirate signs/maps to "Brit" signs/maps; from American Colonies to Westward trek signs/maps; CSA/KGC/"Outlaws" signs/maps... you get the "picture"... 
POINT me to ONE source on the NET... I will continue to share FREE, what I find... THANKS!!! 
