| Author: | Valigursky, Ed, 1926-2009 |
| Subject: | PS, Science fiction, Adventure stories, Life on other planets -- Fiction |
| Format: | Text |
| Date issued: | 2020 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Calling World-4 of Kithgol [electronic resource] / Ed Valigursky |