Thought I would share some of my favorite sites for info. https://en.wikipedia.org/wiki/List_of_USAC_Championship_Car_seasons http://www.champcarstats.com/ http://www.ultimateracinghistory.com/usacstock.htm http://www.gdecarli.it/php/index.php?var1=1&var2=2 http://www.the-fastlane.co.uk/racingcircuits/ http://www.champcarstats.com/atlantic/atlantic2.htm http://www.racingsportscars.com/championships.html http://www.ultimateracinghistory.com/ Hope you find something you can use.