 11 kilometers Maxwell Montes, Ishtar Terra Astronomy Magazine, "Astronomy for Kids: Venus" (accessed 2010-11-06) NRAO, "Venusian Mountain Maxwell Montes" (accessed 2010-11-06) NOAA, "Venus Topography and Shaded Relief" (accessed 2010-11-06) National Academy Press, "Physics Through the 1990s: Scientific Interfaces and Technological Applications", National Research Council, 1986, pp.100,