Geological Survey of New Jersey. Atlas Sheet 6 (Central Red Sandstone) (1885) New Jersey Geological Survey Relief shown by 20 ft. (hilly portions) and 10 ft. (low country) contour intervals and spot heights. "From original surveys and levelings based on the triangulation of the U.S. Coast and Geodetic Survey. In upper margin: Geological Survey of New Jersey. Atlas sheet no. 6. (Central Red Sandstone.)