The Sea of Monsters
Rick Riordan
Percy Jackson & The Olympians (2)
The Lightning Thief
Percy Jackson & The Olympians (1)
Fire in the Valley
Michael Swaine & Paul Freiberger
Zero to One
Peter Thiel & Blake Masters
Mountaineering
The Mountaineers
Hiking Waterfalls in Colorado
Susan Joy Paul
Hiking through History Colorado
Robert Hurst
Hiking Colorado: A Guide to the State's Greatest Hiking Adventures
Sandy Heise & Maryann Gaug
60 Hikes Within 60 Miles: Denver and Boulder
Kim Lipker