| Author: | Darwin, Charles, 1809-1882 |
| Subject: | QH, Earthworms, Soils, Humification |
| Format: | Text |
| Date issued: | 2000 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | The Formation of Vegetable Mould Through the Action of Worms : With Observations on Their Habits [electronic resource] / Charles Darwin |