I gave my auto/racing library to the International Motor Racing Research Center at Watkins Glen. Included was a book that listed all the auto racing tracks that have existed in each of the United States, with data on each including dates of operation. You might call the IMRRC, ask for Bill Green, (607-535-9044), their historian, use my name as we're OLD friends. Bill might have other information that will at least tell you if it was an auto or horse track. Another approach would be to go to the Township or County tax office, lookup the current deed info, and then go to the Clerk's office and track the deed/s back. There's the chance that, the track might have been privately owned, on someone's farm and the deed wouldn't reflect its use.