| Author: | Silverberg, Robert, 1935- |
| Subject: | PS, Short stories, Inventors -- Fiction, Human-alien encounters -- Fiction, Science fiction |
| Format: | Text |
| Date issued: | 2021 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Harwood's Vortex [electronic resource] / Robert Silverberg |