| Author: | Mason, David, 1924-1974 |
| Subject: | PS, Science fiction, Short stories, Time travel -- Fiction |
| Format: | Electronic text |
| Date issued: | 2022 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Placebo [electronic resource] / David Mason |