Pleasant Valley War by Jinx Pyle, Paper cover.
This book reviews the history of what was also known as the Graham-Tewksbury Feud.  It started in Pleasant Valley, AZ, which includes the town of Young, AZ, around the 1880's. Conflicts over resources by sheep raisers and ranchers, horse-thieves, cattle rustling, cattle brands being changed and tempers flaring started the action.
 
This book is written by Jinx Pyle, longtime historian and resident of Rim Country in Arizona.