| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| February 1968 |
|
Analog Science Fiction -> Science Fact, February 1968 | Condé Nast | MAGAZINE | 171|171.1 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| February 1968 |
|
Analog Science Fiction -> Science Fact, February 1968 | Condé Nast | MAGAZINE | 171|171.1 |