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Subjects
History, Civilization, Conservation of natural resources, Nature conservation, Civilisation, Histoire, Human ecology, Intellectual life, Sources, Wilderness areas, Conservation, Ecology, Effect of human beings on, Environmental conditions, Frontier and pioneer life, Nature, Philosophy of nature, Social aspects, United States, United states, biography, United states, civilization, Values, 20th century, Addresses, essays, lectures, Aspect socialID Numbers
- OLID: OL21252A
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| September 11, 2008 | Edited by RenameBot | fix author name |
| April 1, 2008 | Created by an anonymous user | initial import |