This collection includes newspaper clippings, postal cards, typed copies of letters, photographs of portraits, reprints of articles, materials from the John Bartram Association (which preserves the Bartram house and garden in Philadelphia), typed notes from Bartram's letters and journals, and typed copies of letters in re Bartram. There is also a genealogy prepared by West, and a biography of George Washington Bartram by John Hines Pitman (typescript).

The manuscripts of father William Mitchell and daughter Maria Mitchell are not easily separated, and are treated here together. The collection includes William Mitchell's autobiography, his memoir of Judge Walter Folger of Nantucket, astronomical and meteorological observations, lectures, family and other correspondence.