Strobe, Robert, Rice, William, and Neal, C. A., 1995, Topographic maps of Novarupta dome and selected portions of the Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska: U.S. Geological Survey Open-File Report OF 95-0619, unpaged, 4 plates, scale 1:48,000 and 1:2,400.