Wild Life on the Rockies

Classic nature book, first published in 1909. According to Wikipedia: "Enos A. Mills was born in Kansas but moved to Colorado early in his life during a bout with tuberculosis. At age 15, he made his first ascent of the 14,255-foot Longs Peak. Over the course of his life, he made the trip 40 times by himself and nearly 300 additional times as a guide. In 1887, after returning to health, he moved to Butte, Montana. There he lived and worked intermittently until 1902, spending more summers traveling the West Coast of the United States, Alaska, and Europe. In 1889, he had a chance encounter with famed naturalist John Muir on a San Francisco beach, and from that point on Mills dedicated his life to conservation activism, lecturing, and writing."