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Appendix D. Directors of U.S. Naval Communications 1912-1942Appendix E.U.S. Naval Attachés in Tokyo, 1914-1941; Appendix F.U.S. Navy, Office of the Chief of Naval Operations, Section "OP-20-G" and Its Antecedents; Appendix G. Officers in Charge, Office of Naval Communications, Code and Signal Section, "Research Desk" (OP-20-GX); Appendix H. Officers in Charge, Office of Naval Communications, Code and Signal Section, Translation Section (OP-20-GZ); Appendix I. Growth of U.S. Navy Radio Intelligence; Appendix J.U.S. Naval Radio Intelligence, Primarily Focused upon Japan, as of December 1941.