Hidden Champions
Hermann Simon
Oil!
Upton Sinclair
King Coal
The Coal War (1)
The Most Dangerous Man in America
Bill Minutaglio
Hiking through History Colorado
Robert Hurst
Hiking Colorado: A Guide to the State's Greatest Hiking Adventures
Sandy Heise & Maryann Gaug
Hiking Waterfalls in Colorado
Susan Joy Paul
60 Hikes Within 60 Miles: Denver and Boulder
Kim Lipker
Mountaineering
The Mountaineers