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abundance Acra acreage acres of wetlands acres Type Atlantic south birds breeding bulrush cattails Central south coastal saline Conservation Department photo cordgrass County crops Dakota deep fresh marshes Department of Agriculture Distribution drained duck food ducks and geese Federal Fish and Wildlife flooded salt marshes flyway Flyway area fowl fresh meadows fur animals growing season importance to waterfowl impound improvement included inland fresh Lesser Maidencane Map and view marsh elder migration million acres Mississippi north muskrats nesting open fresh water overflow lands Pacific north peat and muck percent planning plants Plate ponds pondweed potholes preservation projects public refuges reclamation region saline salt flats salt marshes Scirpus shallow fresh marshes Soil Conservation Service South Dakota spatterdocks species swamps tion U. S. Department U.S. total United upland vegetation waterfowl acres waterfowl habitat waterfowl refuges waterfowl values waterlogged wetlands inventory wildlife Wildlife Service wood ducks wooded swamps Zizaniopsis