The collection consists of an album of photographs depicting the Allison V. Armour expedition to the Yucatán peninsula in Mexico, a research expedition undertaken in 1895 by curators from the Field Museum of Natural History in Chicago. Photographs in the album focus mainly on the Mayan ruins visited by members of the expedition, with additional photographs of local scenery and the expedition group.

The collection contains photographs, notes, articles, and other materials from explorer Edna R. Webster and her daughter Marjorie Webster. The majority of materials in the collection relate to Edna's exploration and study of Mayan ruins on the Yucatán Peninsula in Mexico, and Marjorie's interest in Atlantis and its possible connection to Mexico.