New Jersey. Department of Conservation and Development. Division of Geology and Topography. Atlas Sheet 21 (1931) New Jersey Geological Survey. Relief show by 20 ft. contour intervals and spot heights. Title was not given. Region covered: Kittatinny Valley and Mountain. Original survey 1880 and 1883, principal features revised 1913, 1926. Original survey and revisions to 1913 made under direction of C. C. Vermeule, Topographer. Revision of 1926 by L. P. Plummer, Topographic Engineer. Map partly revised in 1931.