Page:Popular Science Monthly Volume 70.djvu/106

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 Waterfall of stream draining the broad, U-shaped valley seen near water in right-hand half of picture. Photograph by Lawrence Martin.

feature a view up or down such a valley is not usually very extensive, being cut off by the projecting spurs around which the stream swings. The absence of this feature in those Alaskan valleys where there is a

 Photograph by Lawrence Martin.