Contents

19 May 1972
Vol 176, Issue 4036

About The Cover

View southeast along the Sierra Nevada, California (from about 70,000 feet). Foreground area is Emigrant Basin, north of the prominent Grand Canyon of the Tuolumne River in Yosemite National Park; Mono Lake is in left middle distance. Owens Valley is elongate depression beyond Sierras near top of view. see page 790. [U.S. Geological Survey photograph (No. HA041L-004) taken 2 April 1970 by the U.S. Air Force]