Join Charles Sheldon in this wonderful book recording two years of field experiences while engaged in studying wild sheep of Yukon Territory from 1904 to 1905. This detailed account is strictly from the point of view of a hunter interested in natural history. Sheldon traveled by steamboat, canoe, horseback, and on foot and was was accompanied by other well-known explorers of his generation such as Frederick C. Selous, William H. Osgood, and Carl Rungius. Along with mountain sheep, Sheldon also encounters moose, grizzly bears, and caribou. The Wilderness of the Upper Yukon is profusely illustrated with nearly 100 photographs and paintings from the trip including four detailed maps of his travels.

A comment from Sheldon's Preface:
In the North, wild sheep dwell exclusively on high mountains, above timber-line, usually well back within the ranges. Nearly all of the mountains on which I hunted, with the exception of Plateau Mountain and those near Watson River, were untrodden by the foot of white man or Indian. The wilderness was primeval, the sheep practically undisturbed, the other game animals seldom hunted. It was not possible to find guides, for there were none. It was necessary not only to search out a route to the mountains, but also to find the ranges occupied by sheep.