Breaking the ring - Barron, John, 1930-2005. (Boston : Houghton Mifflin, 1987)
Includes index.
Bibliography: p. 225-236.
Keywords: Walker, John A., -- Jr. -- 1937-2014.; Walker family; Whitworth, Jerry, -- 1939-; United States. -- Federal Bureau of Investigation; United States. -- Navy -- Communication systems; Espionage, Soviet -- United States -- History