| Author: | Smith, George O. (George Oliver), 1911-1981 |
| Subject: | PS, Science fiction, Artificial intelligence -- Fiction |
| Format: | Text |
| Date issued: | 2006 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | The Fourth "R" [electronic resource] / George O. Smith |