Mountaineers Books has published “Yellowstone to Yukon: Freedom to Roam,” with more than 200 full-color images by Florian Schulz (see Portfolio, page 12) and a foreword by Robert Kennedy Jr. Schulz documents the landscape, plants, animals and people of an ecosystem that exists along the spine of the Rocky Mountains. Although the wildness is still untouched by man, it lies in the path of encroaching development.

Contributing essayists Karsten Heuer, David Suzuki, Rick Bass and David Quammen describe...