Index map of Delaware River - Philadelphia, Pa. to Trenton, N.J. from a survey of 1951.PDFhttps://doi.org/doi:10.7282/T3CJ8J31engPublicDelaware River - Philadelphia, Pa. to Trenton, N.J. - Survey of 1951 - Index mapMapsUnited States--Delaware RiverPennsylvaniaPennsylvania--PhiladelphiaNew JerseyRutgers University-New Brunswick