This primary source comes from the Records of the Office of the Chief of Ordnance.
National Archives Identifier:
7450283Full Citation: Female Drill Operator at Watertown Arsenal; 1918; Photographs, 1908 - 1962; Records of the Office of the Chief of Ordnance, Record Group 156; National Archives at Boston, Waltham, MA. [Online Version, https://docsteach.org/documents/document/female-drill-operator, March 29, 2024]