White Clay Creek Preserve, Chester County, Pennsylvania, New Castle County, Delaware : a scenic valley and the arc corner

per Faill, Rodger T.
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Department of Environmental Resources, Office of Parks and Forestry, Bureau of Topographic and Geologic Survey and Bureau of State Parks : State of Delaware, Delaware Geological Survey and Department of Natural Resources and Environmental Control, Division of Parks and Recreation, 1991