The collection contains correspondence, cards, photographic prints and negatives, advertisements, bills, and ephemera. The bulk of the collection is comprised of correspondence and cards addressed to Mary dated between 1942-1968. A significant portion of the correspondence is from 1956, when Mary’s mother Edith and sister Hazel traveled to Chicago. Correspondents include Edith McCarthy, Hazel McCarthy, William McCarthy, Mrs. Kenneth Lingley, Blanch McCarthy, and Frank "Tex" Branning.