The collection contains materials related to Edna and Marjorie Webster's exploration and study of Mayan ruins in the Yucatán Peninsula, including photographs from Edna's visits to multiple Mayan sites in the 1930s, and binders compiled by Marjorie of photographs and articles related to those sites. The collection also includes materials collected by Marjorie on the legendary ancient civilization Atlantis, and the possibility of its connection to Mexican ancient civilizations.