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SULPHUR ON UNALASKA AND AKUN ISLANDS AND NEAR STEPOVAK BAY, ALASKA
Maddren, A. G., 1919, Sulphur on Unalaska and Akun islands and near Stepovak Bay, Alaska: U.S. Geological Survey Bulletin 0692-E, p. 283-298, 1 plate, scale unknown. full-text PDF : 479 KB