Hildreth, Wes, Fierstein, Judy, and Calvert, A.T., 2007, Blue Mountain and The Gas Rocks; rear-arc dome clusters on the Alaska Peninsula: in Haeussler, P.J., and Galloway, J.P., eds., Studies by the U.S. Geological Survey in Alaska, U.S. Geological Survey Professional Paper 1739-A, 27 p., available at http://pubs.usgs.gov/pp/pp1739/a/ .
USGS website with link to full-text PDF