TY - BOOK ID - 32597144 TI - Breaking the ring: the rise and fall of the Walker family spy network PY - 1987 SN - 0380705206 PB - New York, N.Y. Avon DB - UniCat KW - Spies KW - Secret service KW - Espions KW - Service secret KW - English literature KW - Walker, John Anthony, 1937 KW - -Walker family. KW - Whitworth, Jerry, 1939 KW - -Espionage, Soviet - United States - History - 20th century. KW - United States. Navy - Communication systems. UR - https://www.unicat.be/uniCat?func=search&query=sysid:32597144 AB - ER -