Box eleven contains photographs related to various research topics with corresponding materials and paperwork in other series. Topics include sacred sites and hot springs research (South Dakota, Nebraska, Wyoming, and Montana), Washington Marlatt homestead, the razing of the Kansas Artificial Breeding Service buildings, miscellaneous postcards, and a Yucatan photo booklet.

Box four contains research materials related to Mesoamerica and, more specifically, Pat's Mayan measurement system research. Items include correspondence about the project with Hanne Christiansen and others, NEH and NSF grant applications, project-related manuscripts, comments from other scholars, measurement reports, and site floor plans. Box four also includes materials related to the Prehistoric Native Americans of the Great Plains series.