"Hairs vs. Squares: The Mustache Gang, the Big Red Machine, and the Tumultuous Summer of '72" by Ed Gruver is a 2016 published book that delves into the history of baseball during the 1970s. The narrative focuses on the contrast between two baseball teams, the Hairs and the Squares, and the unique players on each team, including the legendary players such as the Mustache Gang and the Big Red Machine. The book is authored by Ed Gruver and illustrated, providing a comprehensive look at the sport of baseball during this tumultuous summer of 1972. With 408 pages, this hardcover book is a valuable addition to any sports and recreation enthusiast's collection.