| Author: | Piper, H. Beam, 1904-1964 |
| Subject: | PS, Space colonies -- Fiction, Science fiction |
| Format: | Text |
| Date issued: | 2006 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Four-Day Planet [electronic resource] / H. Beam Piper |