| Author: | Roth, Lászlo, 1906-2005 |
| Subject: | TJ, PZ, Machinery -- Juvenile literature |
| Format: | Text |
| Date issued: | 2017 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Machines at Work [electronic resource] / Lászlo Roth |