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- Natural history[remove]65
- Description and travel61
- Travel11
- Agriculture8
- History8
- Environmental conditions7
- Mines and mineral resources7
- Commerce6
- Scientific expeditions6
- Indians of North America5
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- Ecology3
- Environmental protection3
- Growth3
- Indians of Mexico3
- Muir, John, 1838-19143
- Naturalists3
- O'Malley, Penelope Grenoble3
- Wilderness areas3
- Animals2