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John Heinz National Wildlife Refuge at Tinicum, Darby Creek canoe trai...
"March 2002." At head of panel title: U.S. Fish & Wildlife Service. Includes location map (inset). Text, index (part), and ill. on verso. Available also through the Library of Congress Web site as a raster image.
John Heinz National Wildlife Refuge at Tinicum
Includes note and location map (inset). Text and "Impoundment trail map" on verso. Available also through the Library of Congress Web site as a raster image.