| Author: | J. Ā. K. |
| Subject: | PZ, Siblings -- Juvenile fiction, Natural history -- Juvenile fiction, Play -- Juvenile fiction, Physical sciences -- Juvenile fiction, Scientific recreations -- Juvenile fiction |
| Format: | Electronic text |
| Date issued: | 2016 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Professor Johnny [electronic resource] / J. Ā. K. |