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North Pacific air routes over the Aleutian volcanic arc.[1] (http://www.avo.alaska.edu/avo4/atlas/volc/spurr/spurr2004/popup.htm?airroutes.jpg) From the Alaska Volcano Observatory, (http://www.avo.alaska.edu/) a joint program of the United States Geological Survey, (http://www.usgs.gov/) the Geophysical Institute of the University of Alaska Fairbanks, and the State of Alaska Division of Geological and Geophysical Surveys. This image contained no copyright information and is assumed to be freely available as a USGS image.
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![[1]](http://www.avo.alaska.edu/avo4/atlas/volc/spurr/spurr2004/popup.htm?airroutes.jpg){kind=link}
