Restricted correspondence files, 300 – 400 series, 1967 – 1971. (1967 – 1972) Box 2 Unit ID: 5 Date: 1967 – 1971. (1967 – 1972)
Schedules of correspondence and telegrams sent and received, 1912 – 1924 Box 7 Unit ID: 5 Date: 1912 – 1924
Secret and confidential correspondence files, 1943 – 1953. (1936 – 1958) Box 7 Unit ID: 3 Date: 1943 – 1953. (1936 – 1958)
Secret and confidential correspondence files, alphabetical prefix series, 1913 -1968 Box 6 Date: 1913 -1968
Secret and confidential correspondence files, MP series, 1907 – 1942. (1926 – 1941) Box 7 Unit ID: 2 Date: 1907 – 1942. (1926 – 1941)
Secret and confidential correspondence files MP yearly number series, 1922 – 1954 (1922 – 1956) Box 6 Unit ID: 1 Date: 1922 – 1954 (1922 – 1956)