This primary source comes from the Records of the Immigration and Naturalization Service.
Full Citation: Letter from J. B. Densmore to the Secretary of State Regarding the Number of American Citizens who have Sailed for and Returned from Europe from August 1 to August 12, 1914; 8/14/1914; 53854/39; European War - German Refugees - Deportation of Italians - Alien Deportations, 1914 - 1915 ; Subject and Policy Files, 1893 - 1957; Records of the Immigration and Naturalization Service, Record Group 85; National Archives at Washington, DC. [Online Version, https://www.docsteach.org/documents/document/densmore-secretary-state, March 29, 2024]