Black and white photograph of the front of a two-story house with a large front porch. There are no porch awnings, and the photo was taken at an angle from the street.

Black and white photograph of the side of a two-story house with a large front porch. There are no porch awnings.

Black and white photograph of the front of a two-story house with a large front porch. There are no porch awnings, and the photo was taken at an angle from a distance.

Black and white photograph of trees and fields with the town of Gettysburg, Pennsylvania in the background.

Black and white photograph of a truck parked on a dirt road on the side of a mountain. Two people are leaning against the stone wall, looking out at the countryside below. A crew of seven men are clearing a rockslide covering part of the road.

Black and white photograph of a town on in the Blue Ridge Mountains, overlooking countryside. In the midground, a building with a sign reading "Nathans" is visible.

Black and white photograph of a Lena Merrill standing next to a river with bridges and buildings visible in the background.

Black and white photograph of an automobile parked next to an earthen mound.

Black and white photograph of an excavation site at the Jonio Farm. Numbered markers are scattered among the excavated areas. A dog is visible sitting and a man can be seen working on the right side of the image.

Black and white photograph of a map of the Excavation at Jonio Farm.

Black and white photograph of the statistic sheets from the mastodon excavation project at Jonio Farm.

Black and white photograph of two men standing over mastodon bones in an excavation site at Jonio Farm. Another man is visible working in the background.

Black and white photograph of four men working on the mammoth skeleton excavation site at Jonio Farm. At the left, a man leans over a mammoth pelvis bone in plaster.

Black and white photograph of a woman standing in a forest.

Black and white photograph of a person sitting on the edge of a terrace overlooking a pyramid in a field.

Black and white photograph of the side of the Tenayuca pyramid. Next to the stone wall of the pyramid are smaller stone walls forming a courtyard area around the pyramid, and a statue in a sunken courtyard area.

Black and white photograph of a man standing in a doorway in the Tenayuca pyramid. Several children sit on the steps in front of the door, and another child stands on the other side of a sculpture next to the door on the right side of the frame.…

Black and white photograph of two men standing next to a stone wall of the Quetzalcoatl pyramid. Stone walls and carved designs and sculptures are visible around them. The image appears to be double exposed with another image of a rocky hillside or…

Black and white photograph of a dirt road leading to a pyramid on the top of a mountain.

Black and white photograph of a pyramid. A lower level is visible with a stone wall surrounding a stone building built into a hillside. A water tower is visible behind the building. Another building is visible is on top of a hill behind the first…

Black and white photograph of the active Jewel Geyser in front of a forest at Yellowstone National Park.

Black and white close-up photograph of Punch Bowl Spring in Yellowstone National Park.

Black and white photograph of the Fountain Geyser at Yellowstone National Park. Steam is rising from the geyser, and a pine tree stands between the geyser and the photographer.

Black and white photograph of Gibbon Falls in Yellowstone National Park. Gibbon Falls is surrounded by mountains and forest.