Black and white photograph of a dam, possibly the Hetch Hetchy. A road is carved into the mountainside next to the dam.

Black and white photograph of three people at the top of a mountain in Yosemite National Park. They are standing by the railings of a viewing platform.

Black and white photograph of the side of a mountain across a river.

Black and white photograph of a mountain range.

Black and white photograph of mountain clif faces.

Black and white photograph of a man standing between a tour vehicle and a pump. A group of people are seated in the vehicle.

Black and white photograph of two tall pine trees in a forest.

Black and white photograph of trees in a forest.

Black and white photograph of a large tree in a forest.

Black and white aerial photograph of Yosemite Valley.

Black and white photograph of the Yosemite Valley.

Black and white photograph of a steel bridge over the Colorado River in Yuma, Arizona. Lettering on the bridge reads "OCEAN - TO - OCEAN HIGHWAY YUMA.".

Black and white photograph of nine people, seven men and two women, in a cavern.