The World Must Never Know
| First published | April 1963 |
|---|---|
| Type | Short Fiction |
| Length | Short Story |
| Series | Mad Friend #6 |
Publications (4)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| April 1963 | The Magazine of Fantasy and Science Fiction, April 1963 | Mercury Press, Inc. | MAGAZINE | 102 |
| August 1963 | The Magazine of Fantasy and Science Fiction, August 1963 | Atlas Publishing and Distribution Co. Ltd | MAGAZINE | 2 |
| 1965 | The Ship That Sailed the Time Stream / Stranger Than You Think | Ace Books | Omnibus | 56 |
| August 1993 | Under South American Skies | DAW Books | Anthology | 187 |