Vol. 36, No. 5 (May, 1951). Spine leaning a bit; else very good. 
This issue contains "Down the Narrows of the Virgin River" by Lewis F. Clark, "Aldo Leopold - Champion of Wilderness" by Harold C. Bradley, "Robinson Crusoe in the Sierra Nevada: The Story of Moses Schallenberger at Donner Lake in 1844-45" by Edwin C. Gudde, "Yosemite's Pioneer Cabins" by Robert F. Uhte, "Stephen Mather and the National Parks" by Horace M. Albright, "On the Study of Avalanches" by André Roch, "The First Ascent of Mount Deception" by Bradford Washburn, etc. Illus. with photos.