Included are the wills of both James and Mary O'Hara, along with an essay written by Henry Marie Brackenridge critiquing the will of James O'Hara. Materials related to his estate include an article describing Mary E. Schenley's law suit against James O'Hara's executors and an 1881 newspaper clipping entitled "Sheriff"s Sales". James O'Hara's obituary and a number of brief, typed excerpts from the
Pittsburgh Mercury, and the Pennsylvania Archives describe General James O'Hara and some of his accomplishments in the military. In an additional published item, John Heckewelder discusses General O'Hara's influence on the interaction between Indians and settlers. The collection also contains a typed O'Hara family genealogy, a family biography, and two portraits of James O'Hara.