A copy of the proclamation by President Calvin Coolidge creating the Craters of the Moon National Monument. The proclamation includes a map of the boundaries, approximately 39 square miles near Arco, Idaho. The rubber-stamped signature on the...
Four men from the June 1921 expedition examine a large crater in the volcanic floor, including Robert W. Limbert (far right). A rifle sits in the distance.
A line of pack horses make a half circle as they cross the volcanic soil of the Craters of the Moon area. The horses are barely distinguishable from the rocks on the right side of the photo, about a quarter of the way down from the top.
Spokane Scientist Elsie Hanft (left) kneels in front of a white tepee while a Native American woman and a young girl sit around it, photograph taken during an expedition to Lost Valley, near Craters of the Moon.
Printed in Robert W. Limbert's National Geographic article on his expeditions, this is an interior shot of what he called Amphitheater Cave in Craters of the Moon. "This is one of a series of eight caves found near the Bridge of Tears. It is an...
Flyer designed by Robert W. Limbert inviting people to visit the new national monument, established by U.S. President Calvin Coolidge to "preserve the unusual and weird volcanic formations."
Scattered in the lava ash were hundreds of bear tracks that could be traced for miles. The rumor of a dwarf grizzly bear was one of the initial reasons why Robert W. Limbert wanted to explore the unnamed Craters of the Moon area since the mid-1910s.
Robert W. Limbert and his exploration party stop to pose on a large volcanic mass. Two men stand on parts of the volcanic rock, while another man sits inside.
The lack of roads across uneven volcanic ground made this expedition into Craters of the Moon dangerous and tiring for both the men and animals involved.
Five male explorers rest in the cave that explorer Robert W. Limbert named Amphitheater Cave. Limbert described the cave as being "explored for half a mile underground until we came across apparently fresh bear tracks when we turned around and came...
Robert W. Limbert stands behind his camera and films a large explosion pit found at the east end of the area. Two unidentified men stand on either side of him.
