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Nature conservation --- Wilderness areas --- Environmental policy --- Economic aspects --- Lands, Protected wild --- Places, Protected wild --- Protected wild lands --- Protected wild places --- Protected wildlands --- Regions, Wilderness --- Wild lands, Protected --- Wild places, Protected --- Wilderness regions --- Wildlands, Protected --- Conservation of nature --- Nature --- Nature protection --- Protection of nature --- Conservation --- National parks and reserves --- Natural areas --- Protected areas --- Conservation of natural resources --- Applied ecology --- Conservation biology --- Endangered ecosystems --- Nature conservation - Economic aspects - United States - Congresses --- Wilderness areas - United States - Congresses --- Environmental policy - United States - Congresses