Jordan,
Here are a few from my bookshelf that I've enjoyed again and again:
Do you like Biographies?

"Gentlemen,Start Your Engines" by Wilbur Shaw
Pub.Coward-McCann 1955

"A.J." by A.J. Foyt with William Neely
Pub.Times Books 1983

"Whats It Like Out There?" by Mario Andretti with Bob Collins
Pub.Henry Regnery 1970

Do you like History?

"Vintage & Historic Indianapolis Race Cars" by Dan Owen
Pub.MBI Publishing 1998


"Ford:The Dust And The Glory.A Racing History" by Leo Levine
Pub.Macmillan Co. 1968

Several of these books are out of print. Lucky for me, I do my shopping at used book stores,swap meets and garage sales. And,don't forget about your local Public library.I've always found them to be eager to help in the search for a hard to find book.