| ID | 041821 |
| Call Number | 327.120924/COS |
| Title Proper | Mask of treachery |
| Other Title Information | first documented Dossier on Blunt, MI5, and Soviet Subversion |
| Language | ENG |
| Author | Costello, John |
| Publication | London, William Collens Sons Co. Ltd., 1988. |
| Description | 761p.+ 22cm. |
| Classification Number | 327.120924 |
| Key Words | Anti-British Espionage ; Secret Service ; Espionage |