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Hetch Hetchy Valley

(Encyclopedia) Hetch Hetchy Valley, in Yosemite National Park , central Calif., on the Tuolumne River. It once rivaled Yosemite Valley in beauty and grandeur. O'Shaughnessy Dam (completed 1923; enl. 193...

Yosemite National Park

(Encyclopedia) Yosemite National Park yōsĕm´ĭtē [key], 748,436 acres (302,881 hectares), E central Calif.; est. 1890 as a result of the efforts of conservationist John Muir . Located in the Sierra...