| |
|
American spies
|
123493 |
| |
|
Defectors to the United States
|
123494 |
| |
|
Polish defectors
|
123495 |
| |
|
Eastern Bloc spies for the West
|
123497 |
| |
|
Gervase Cowell
|
123504 |
| |
|
George Kisevalter
|
123505 |
| |
|
Soviet military attachés
|
123507 |
| |
|
20th-century surface-to-air missiles
|
124374 |
| |
|
Rocketdyne
|
124506 |
| |
|
Electronic engineering
|
123521 |