Relief shown by contour lines and spot heights. Contour intervals 10 and 20 feet. Depths shown by soundings and isolines. "From original surveys and levelings, supplemented by various Local Surveys, based on the triangulation of the U.S. Coast and Geodetic Survey." In top margin: Geological Survey of New Jersey - atlas sheet no. 6 (Central Red Sandstone). Originally issued folded in covers 24 x 17 cm.