Subseries consists of medical documents, village health statistics, cross-check interviews, and hospital patient records.

File contains filled interview forms. Researchers used interviews to discuss respondents' health, history, and nature with the Bale (the traditional chief, judge, or leader) of each compound. Interview answers served to cross-check respondents' questionnaire information.

Series is comprised of materials related to the 1961 Cornell-Aro Research Project in the Western Region and the 1963 Study on the Role of Women. In the Cornell-Aro study, modeled on the Stirling County Study, Leighton’s team analyze the mental health trends of Nigerians living in both major cities and small rural villages via interviews, surveys, and observations. The Role of Women study may possibly be considered a ‘sub-study’ of the Cornell-Aro study, as it uses much of the same research material supplemented by new data. Materials present include correspondence, memoranda, datasets, research notes, fieldnotes reports, speeches, photographs, forms, applications, surveys and questionnaires, medical documents, affiliated studies, and comparative analyses.