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abandoned accelerated acres American landscape Appalachian Mountains Appalachians areas aspen automobile became burned Burroweed cattle century cities Civil Civilian Conservation Corps coast coastal colonial converted cropfields crops Department of Agriculture East eastern forests Environmental erosion farmers federal fire Fish and Wildlife flood Forestry fuel gasoline grazing gullies habitat hardwoods harvest highways horses Hudson's Bay Company impact Indian industry lakes Land Management livestock logging major marshes miles million mineral Mississippi motor mountains National Forest National Park Service Natural Resources nearly North America pastures pines plains plant population prairies produced protect rail railroad River roads Soil Conservation Service south of Canada species square miles streams strip territory Texas thousands Tillamook Tillamook Burn Tillamook State Forest timber tion towns trails trees U.S. Bureau U.S. Fish U.S. Forest Service U.S. Geological Survey U.S. Soil Conservation United Valley vegetation West wetlands wilderness Wildlife Service World Wyoming