The Wilderness of the Upper Yukon, The Wilderness of the North Pacific Coast Islands and The Wilderness of Denali, by Charles Sheldon, 1983, limited to 1000 numbered and signed copies by the author's son and publisher, of which this is number 731. 364, 246, and 412 pages respectively, color frontispiece, black and white photographs and fold-out map. Light edge wear to boards else Fine in issued slipcase. Exploring the Wild Sheep in British Columbia in 1931 and 1932 by William Sheldon, 1981 limited to 1000 numbered and signed copies by the author and publisher, of which this is number 872. 246 pages, color frontispiece and black and white photographs. Fine in issued slipcase.