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