| Author: | Marsh, George P. (George Perkins), 1801-1882 |
| Subject: | GF, Human geography, Physical geography, Conservation of natural resources, Nature -- Effect of human beings on |
| Format: | Electronic text |
| Date issued: | 2004 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | The Earth as Modified by Human Action [electronic resource] / George P. Marsh |