A history of the United States Football League (USFL), a professional football league that played three spring seasons and famously sued the NFL for anti-trust violations, for which the league was famously awarded a mere $1.
Comprehensive history of the USFL. Not the most exciting read because the book focuses on the business end more than what went on on the field of play. Not without interest, though a bit dull.
The definitive biography of the USFL. Long out of print, consider yourself fortunate if you have it or have read it since it is not easy to find. Surprising that another attempt to chronicle the league has not been done, with a recent 30/30 ESPN special and Donald Trump's involvement.