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Wetlands include swamps, bogs, marshes, ponds, and peat lands. Circa 1990. Page 22 (bottom left photo), U.S. Geological Survey Circular 1085.
Fragile wetlands are easily damaged by salt water that invades canals dredged for navigation and oil exploration. Page 17 (top photo), U.S. Geological Survey Circular 1075.
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