- Department of Defense. Department of the Army. U.S. Army Corps of Engineers. North Atlantic Division. U.S. Army Engineer District, New England. 6/14/1979-; War Department. Office of the Chief of Engineers. Boston District. 1/18/1883-10/1/1946
- National Archives at Boston
Original caption: The Merrimack inundates farm buildings at Tyngsboro, Mass., March 1936.