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1891. Geological Survey of New Jersey. Relief shown by contours and spot heights. Depths shown by soundings and isolines. In upper margin: Atlas sheet No. 10 (Lower Delaware). [Trenton, N.J.] : The Survey, 1891, c1887 ([New York] : Julius Bien & Co. Lith.).
1887. Geological Survey of New Jersey. Relief shown by contours and spot heights. "From original surveys and levelings based on the triangulation of the U.S. Coast and Geodetic Survey." ... [Trenton] : Geological Survey of New Jersey, 1887 ([New York] : Julius Bien & Co. Lith.).