1. Geology and submarine physiography of Amchitka Island, Alaska / by Howard A. Powers, Robert R. Coats, and Willis H. Nelson. Powers, Howard A. [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1960.Washington : United States Government Printing Office. Book Online
2. Ocean floor structures northeastern Rat Islands, Alaska / by George L. Snyder. Snyder, George L. (George Leonard), 1927- [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1957.Washington : United States Government Printing Office. Book Online