George Rays rulebooks

This is one of 4 books that the NHRA gave George Ray in the 1960's with supplements. He had them in an old barn, I rescued them in 2004. He ran the last heads-up dragstrip in America. Google George Rays dragstrip if you aren't aware of who he was...sadly he p***ed away in 2009. I worked for him as starter, announcer, finish line referee and track promoter. I am curious as to the value of these books. Anyone have any idea? George used this information to cl***ify Top Stock, Little Stock, Gas, Modified Production and Super Stock through out the 1960's, 1970's, 1980's and 1990's.