Subseries D. Family Papers is comprised of materials relative to John's wife and children. Maria Crowninshield's correspondence is comprised of personal letters she received from John and her sisters. Maria Louisa Crowninshield's journal describes her summer vacation spent at Danvers and a number of day trips to other localities including Andover and Gloucester. There are embroidery letters sketched by Louisa Crowninshield Bacon (born 1842), and a photograph album. John Casper Crowninshield's papers are almost entirely made up of historical research on the family based upon his father's papers. "The Buried Treasure Found" is a novel depicting the discovery of treasure on an unknown island in the Pacific Ocean in 1784. Charles B. Crowninshield's papers include an essay on military fortifications and a scrapbook of orders, correspondence, and accounts from Company E, 1st Regiment of Massachusetts Volunteers during the Mexican-American War.