Essential Matters

History of the Cryptographic Branch of the People's Army of Vietnam 1945-1975 (with a Supplement Drawn from "The History of the Cryptographic Branch of the Border Guard, 1959-1989")

The Quest for Cryptological Centralization and the Establishment of NSA

1940-1952

The Voynich Manuscript - An Elegant Enigma

Eavesdropping on Hell

Historical Guide to Western Communications Intelligence and the Holocaust, 1939-1945 (Second Edition)

A History of US Communications Intelligence During WWII

Policy and Administration

Masked Dispatches

Cryptograms and Cryptology in American History, 1775-1900

The Quiet Heroes of the Southwest Pacific Theater

An Oral History of the Men and Women of CBB and FRUMEL

Pearl Harbor Revisited

United States Navy Communications Intelligence, 1924-1941