This primary source comes from the Records of the Immigration and Naturalization Service.
Full Citation: Pre-addressed Postcards to be Mailed to the President Advocating Stricter Immigration Laws; 1/1/1911; 53072/002A; Anti-Immigration Material, 1911 - 1921; Subject and Policy Files, 1893 - 1957; Records of the Immigration and Naturalization Service, Record Group 85; National Archives Building, Washington, D.C.. [Online Version, https://docsteach.org/documents/document/postcards-president-advocating-stricter-immigration-laws, February 7, 2025]