Down the Great Unknown: John Wesley Powell's 1869 Journey of Discovery and Tragedy Through the Grand Canyon

The Exploration of the Colorado River and Its Canyons (Penguin Classics)

The Emerald Mile: The Epic Story of the Fastest Ride in History Through the Heart of the Grand Canyon

Beyond the Hundredth Meridian: John Wesley Powell and the Second Opening of the West

Carving Grand Canyon: Evidence, Theories, and Mystery (Second Edition)

The Promise of the Grand Canyon: John Wesley Powell's Perilous Journey and His Vision for the American West

The Exploration of the Colorado River and its Canyons

Billy the Kid: The Endless Ride

The Searchers: The Making of an American Legend

The Man Who Walked Through Time: The Story of the First Trip Afoot Through the Grand Canyon (Vintage Departures)