| Author: | Krepps, Robert W., 1919-1980 |
| Subject: | PS, Science fiction, England -- Fiction, Human-alien encounters -- Fiction, Vision -- Fiction |
| Format: | Electronic text |
| Date issued: | 2021 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Beware, the Usurpers! [electronic resource] / Robert W. Krepps |