Not to Be Opened—
| First published | January 1950 |
|---|---|
| Type | Short Fiction |
| Length | Novelette |
Publications (3)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| January 1950 | Astounding Science Fiction, January 1950 | Street & Smith Publications, Inc. | MAGAZINE | 33 |
| August 1951 | The Best Science-Fiction Stories: 1951 | Frederick Fell | Anthology | 85 |
| September 1951 | The Best Science-Fiction Stories: 1951 | Frederick Fell | Anthology | 85 |