| Author: | Nourse, Alan Edward, 1928-1992 |
| Subject: | PS, Science fiction |
| Format: | Text |
| Date issued: | 2020 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Sixty-Year Extension [electronic resource] / Alan Edward Nourse |