John Kryk has written a fascinating, well-researched book on the stormy rivalry between the two greatest traditions in college football history. It is filled with great stories about legendary coaches and players and the games they played. If you love college football. Natural Enemies is a must read.

– Lloyd H. Carr, head football coach, University of Michigan

John Kryk does a superb job of describing the history of one of college football's greatest rivalries, and the famous personalities involved in it.... His use of this material—almost all of it never in print before this book—gives an authenticity and depth ... that almost no other sports history possesses.

– Murray Sperber, author of Shake Down the Thunder: The Creation of Notre Dame Football

The definitive history of the rivalry.

– Chicago Tribune

Rewarding ... Kryk's research pays some real dividends.

– Ann Arbor News

Natural Enemies is a well-researched, carefully assembled historical analysis of the characters and times that shaped this rivalry.... The developmental years of this rivalry and Kryk's well-timed story-telling are most captivating.... It is an enlightening read for football historians and fans alike.

– College Sports Magazine