The Mary T. Hall Papers consist of correspondence, minutes, reports, flyers, pamphlets, newspaper clippings, and other types of material that document her work with various social welfare and world peace organizations. The papers from the Missouri Children's Code Commission document the formation of the group, the recommended bills, the final report, and the efforts to pass all the bills. The collection also includes papers regarding Child Welfare Services and the Board of Children's Guardians. The papers from the Urban League primarily regard the Industrial Committee and efforts to get jobs for African Americans during World War II. They also include a survey of beauty parlor operators (Box 15/Folder 4) with completed questionnaires, and various reports on services for African Americans. The collection also contains papers regarding the United Nations Association, Lindenwood College, the Barnard Free Skin and Cancer Hospital, and political campaigns for Adlai Stevenson and George McGovern. Several boxes of correspondence from Hall's family and friends, dating from the 1930s and 1940s, can be found at the end of the collection.