thrift store find

I found a paperback book, written by John Heisman, on football principles. They had too many old books so this one was free. The Heisman Memorial Trophy is named after him and presented to the best collegiate player each year. It was boring to me, principles, diagrams and moral teachings. No pix. The signature in the back was printed.
But I sold it for $62 on eBay! What fun!