Yes and yes, Jim.
There is documented testimony from friends who had read what he had completed to where, at that point in his life he had already been diagnosed, and was seriously handicapped because of it....but was still determined to continue his search for the treasure, if they were willing to help him find and recover it. They described the manuscript as excellent.
He describes his finding of the H/P stone while wandering around near the highway during a break from his drive from Hood River to Texas, and then, on the next trip to Texas with his wife and his Uncle Robert along this time, camping beside Queen Creek while he tried to figure out how to use the H/P stone to find what, by then, he had been told (initially at a gas station in Texas) and believed the stone represented (a Spanish treasure of some kind) He details how he used 8-N-P in combination with something else on the H/P stone to eventually find the other three stones. He and his uncle, with some help from two locals initially, then begin to follow what they believe is the trail to as many as 8 Peralta mines deep within the Superstition Mountains. For Travis, it begins where he found the Map stones. Later, while describing how his Uncle Phil joined him in a subsequent search, and where they looked, he describes what they then believe is a Peralta treasure room at the end of a fifteen mile trail, along with what they both believe is likely within.