European Axis Signal Intelligence in World War II

An omnibus edition of nine volumes of postwar histories declassified by the National Security Agency in 2010. The research was carried out by the Army Security Agency relying on captured documents and interviews with prisoners. This is an absolutely essential primary reference for anyone interested in cryptography as a vital aspect of World War II.
The volumes include:
Volume I: Synopsis
Volume 2: Notes on German High Level Cryptography and Cryptanalysis

Volume 3: The Signal Intelligence Agency of the Supreme Command, Armed Forces

Volume 4: The Signal Intelligence Service of the Army High Command

Volume 5: The German Air Force Signal Intelligence Service
Volume 6: The Foreign Office Cryptanalytic Section
Volume 7: Goering's "Research" Bureau
Volume 8: Miscellaneous

Volume 9: German Traffic Analysis of Russian Communications