John Barron <br/><br/>
Breaking (the Bizarre case of the walker family spy ring) The Ring 
John Barron 
 - Boston  Houghton Mifflin Company  1987 
 - vii, 244 pages;  23 cm 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Walker, John Anthony, 1937- 2. Walker family 3. Whitworth, Jerry 4. Espionage-Soviet Union-History-20th Century 5. Espionge-United States-History-20th century 6.United States- Federal Bureu of Investigation 7. United States. Navy-Communication systems