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Catalogue reference: HW 40/35
This record is about the Reports and correspondence relating to enemy exploitation of merchant shipping codes dating from 1942 Jun 06 - 1946 Mar 01 in the series Government Code and Cypher School: Security of Allied Cyphers Section: Security Files.... It is held at The National Archives, Kew.
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HW 40/35
1942 Jun 06 - 1946 Mar 01
Reports and correspondence relating to enemy exploitation of merchant shipping codes
L4(O)
Public Record(s)
Retained Until 2004
Open Document, Open Description
HW 40
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Records created or inherited by Government Communications Headquarters (GCHQ)
Government Code and Cypher School: Security of Allied Cyphers Section: Security Files...
Reports and correspondence relating to enemy exploitation of merchant shipping codes
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