See William F. Lynch, Narrative of the United States’ Expedition to the River Jordan and the Dead Sea (Philadelphia: Lea and Blanchard, 1849; New York: Arno Press, 2nd ed., 1977). Lynch does not give this height. One has to correlate his description with the statement of Claude-Regnier Conder and H. H. Kitchener in The Survey of Western Palestine, (London: Palestine Exploration Fund, 1883), vol. 3, p. 384.