1935. Cable and pipeline areas denoted.
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1943. Index map of the survey of 1942 of the Delaware River from Philadelphia, PA to Bombay Hook, DE.
1939. United States. Department of the Interior. Map created from a United States Department of the Interior geological survey. Topography was surveyed by R. H. Runyan, 1939. Map consists mainly o...
1979. Map of land use and open space plan presented by the Delaware Valley Regional Planning Commission.