| Author: | Wollheim, Donald A., 1914-1990 |
| Subject: | PS, Pluto (Dwarf planet) -- Fiction, Science fiction |
| Format: | Text |
| Date issued: | 2010 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | The Secret of the Ninth Planet [electronic resource] / Donald A. Wollheim |