The Secret Sentinel (Secret Service Operator #5, May-June 1937)
| First published | May 1937 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| May 1937 |
|
Secret Service Operator #5, May-June 1937 | Popular Publications, Inc. | MAGAZINE | 101 |