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President Teddy Roosevelt and party standing at the base of the Grizzly Giant tree in the Mariposa Grove of Giant Sequoias, Yosemite, 1903. Left to right, two secret service agents; William H. Moody, Secretary of Navy; George Pardee, California…

President Teddy Roosevelt and John Muir standing on rock at Glacier Point, Yosemite, May 1903; Yosemite Falls and cliffs of Yosemite Valley in distance.

Galen Clark standing at the base of the Grizzly Giant tree in the Mariposa Grove of Giant Sequoias, Yosemite, in 1858 or 1859.

O'Shaughnessy Dam, 1938, Yosemite, viewed from a nearby hill; showing front expanse of dam, mouth of tunnel at west end, a portion of Hetch Hetchy Reservoir, and two vehicles on top of dam.

Five U.S. Army soldiers of the 24th Mounted Infantry, mounted on horses near a road in forest.

R.E. Jeffrey's handcrafted motor home, built on the chassis of a 1905 Pierce Arrow; in Yosemite Valley, with Sentinel Hotel in distance.

John Muir (1838-1914) seated on boulder; naturalist and conservationist who initiated efforts resulting in the creation of Yosemite National Park in 1890.

Near view of Ostrander Ski Hut, 1941, Yosemite; backcountry shelter for skiers near Ostrander Lake, with two people standing beside building.

Five men and eight women, with wagons and tent at campsite in Yosemite Valley, circa 1890; George Shaffer party of Oakdale, California.

People camping with tents and automobiles in Stoneman Meadow, below Washington Column, Yosemite Valley, 1927.