A Practical Invention
| First published | July 1972 |
|---|---|
| Type | Short Fiction |
| Length | Short Story |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| July 1972 |
|
The Magazine of Fantasy and Science Fiction, July 1972 | Mercury Press, Inc. | MAGAZINE | 66 |
| March 1973 |
|
Urania #613 | Mondadori | MAGAZINE | 147 |