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Broad valley stage, 15 million years ago, as portrayed in the first of six paintings by H. A. Collins, Sr., depicting geologic stages in the carving of Yosemite Valley.

Mountain valley stage, 10 million years ago, as portrayed in the second of six paintings by H. A. Collins, Sr., depicting geologic stages in the carving of Yosemite Valley.

Canyon stage, 10 to 2 million years ago, as portrayed in the third of six paintings by H. A. Collins, Sr., depicting geologic stages in the carving of Yosemite Valley.

First glacial stage, 2 million years ago, as portrayed in the fourth of six paintings by H. A. Collins, Sr., depicting geologic stages in the carving of Yosemite Valley.

Last glacial stage, 20,000 years ago, as portrayed in the fifth of six paintings by H. A. Collins, Sr., depicting geologic stages in the carving of Yosemite Valley.

Lake stage, 10,000 years ago, as portrayed in the sixth of six paintings by H. A. Collins, Sr., depicting geologic stages in the carving of Yosemite Valley.

Group of twenty-four school children standing and seated on rocks in forest clearing; included in group are Pearl, Pete, Harry, and George Carter; also children from the families of Eidsom, Sutton, Wackerman, and Zimmerman.

Group of about twenty horses and riders in a forest clearing in Yosemite Valley; North Dome in distance; circa 1920s.

Sixteen graduating high school seniors grouped in, on and around a convertible automobile; with school building and two other automobiles in distance, Mariposa, Calif., 1932.

Group portrait of about eighty-five high school students standing and seated on ground in front of Mariposa High School; with automobile parked beside building and hills in distance, Mariposa, Calif., 1932.