I count myself fortunate to have Greg Fielden's Forty Years of Stock Car Racing series of books. I'm really glad I bought them when they were originally published - though I admittedly gulped at the time at investing $125 in them. Today, I use them regularly for research. Plus, the cost of getting a single volume on varying websites often exceeds $125.
Fielden also wrote the book about Charlotte Motor Speedway that Ray Lamm posted earlier.
He also wrote Rumblin' Ragtops about NASCAR's convertible series. I don't have it; however, I've requested it recently through our local library to read a bit about King Richard's first professional race start at Columbia Speedway with the top down.
Greg would make a GREAT addition to this site - if anyone knows how to persuade him to join us here.