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00974nam a2200265 a 4500 001 CD6FA9DC2AD211DEA64D5005A8D7520A 005 200904161706.0 008 880516s1986 enkabf b 00110 eng d 020 $a 9780297787174 020 $a 0297787179 040 $a MiU $c MiU $d SILO $d SILO 100 1 $a West, Nigel. 245 1 $a GCHQ : $b the secret wireless war, 1900-86 / $c Nigel West. 260 $a London : $b Weidenfeld and Nicolson, $c c1986. 300 $a xviii, 294 p., [8] p. of plates : $b ill., maps ; $c 24 cm. 500 $a Includes index. 504 $a Bibliography: p. [272]-277. 610 10 $a Great Britain. $b Government Communications Headquarters. 650 0 $a Military intelligence $z Great Britain. 650 0 $a World War, 1914-1918 $x Cryptography. 650 0 $a World War, 1939-1945 $x Cryptography. 939 $a 917089 941 $a 1 952 $l OVUX522 $d 20231018011513.0 956 $a http://locator.silo.lib.ia.us/search.cgi?index_0=id&term_0=CD6FA9DC2AD211DEA64D5005A8D7520AInitiate Another SILO Locator Search