| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1940 |
|
Doc Savage, April 1940 | Street & Smith Publications, Inc. | MAGAZINE |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1940 |
|
Doc Savage, April 1940 | Street & Smith Publications, Inc. | MAGAZINE |