before_revision: In the USA Wilderness Areas (NWPS) are the strictest category of protected area. They are designated by law in accordance with the Wilderness Act of 1964 by the United States Congress. They must be large enough to adequately preserve its resources and may only be entered on foot, by canoe or on horseback. Exceptions are the extensive areas of wilderness in Alaska. At the beginning of 2010 there were over 750 recognised Wilderness Areas .
after_revision: In the USA Wilderness Areas (NWPS) are the strictest category of protected area. They are designated by law in accordance with the Wilderness Act of 1964 by the United States Congress. They must be large enough to adequately preserve their resources and may only be entered on foot, by canoe or on horseback. Limited exceptions are the extensive areas of wilderness in Alaska. There are over 800 recognised wilderness areas .
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edit_actions: At the beginning of 2010 there were over 750 recognised Wilderness Areas
edit_actions: There are over 800 recognised wilderness areas
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