The Secret Sentinel (Secret Service Operator #5, March-April 1939)
| First published | March 1939 |
|---|---|
| Type | Essay |
Publications (1)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| March 1939 | Secret Service Operator #5, March-April 1939 | Popular Publications, Inc. | MAGAZINE | 4 |