Maddren, A.G., 1919, Sulphur on Unalaska and Akun islands and near Stepovak Bay, Alaska, in U.S. Geological Survey, Mineral resources of Alaska, report on progress of investigations in 1917: U.S. Geological Survey Bulletin 692, p. 283-298.
This publication is part of a larger work. Please see B 692 for more information.
Geology; Non-Metals