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 passed 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 classify Top Stock, Little Stock, Gas, Modified Production and Super Stock through out the 1960's, 1970's, 1980's and 1990's.