Roger H. Cooley & Chase Ewing 
Gray Wolves and the Endangered Species Act [PDF ebook] 

Second only to humans in adapting to climate extremes, gray wolves once ranged from coast to coast and from Alaska to Mexico in North America. By the early 20th century, government-sponsored predator control programs and declines in prey brought gray wolves to near extinction in 48 states. This new book examines the Endangered Species Act as it applies to gray wolves, with a focus on the gray wolf population, recovery, and biology in the United States today.