These occasions include the laying of cornerstones at various churches, funerals, and Sunday School anniversaries and Croswell's published sermon "National Sin Rebuked - A Discourse on the Death of the President of the United States" (1841)
Records of Harry Croswell's immediate family: parents, brothers and sisters, and his own wife and children, with an ALS from Ruth Croswell laid in. (only 17 pp. written)
Diaries, family records and history of the Parish of Trinity Church, New Haven (1740-1820) by Harry Croswell, journalist and later minister of Trinity Church from 1815 until his death. The diaries in 14 volumes (1821-1858), offer a daily record of his life in New Haven as well as accounts of his participation in the work of the church in the surrounding region and in the affairs of Trinity College, Hartford.Croswell also records the formation of the black congregation, St. Luke's, in 1844. Occasional trips to upstate New York (1825, 1841), to Boston and Philadelphia (1821) offer descriptions of these places. In 1915 F. B. Dexter made a transcript of large portions of the diary and also compiled an index.