| Author: | Hela, Martti, 1859-1930 |
| Subject: | PR, Fantasy fiction, Challenger, Professor (Fictitious character) -- Fiction, South America -- Fiction, Dinosaurs -- Fiction, Prehistoric peoples -- Fiction |
| Format: | Text |
| Date issued: | 2016 |
| Language: | Finnish |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Kadonnut maailma [electronic resource] / Martti Hela |