Facts
- Author
- Various
- Language
- English
- Project Gutenberg No.
- 18217
- Released on Project Gutenberg
- April 20, 2006
- Bookshelves
- Children's Instructional Books, Children & Young Adult Reading, Science - Biology, Teaching & Education
- Subjects
- Science – Readers
- Public domain in the USA
- yes
Sources: Project Gutenberg catalogue (public domain), Wikidata (CC0)