Geodetic observations during the 2009 eruption of Redoubt Volcano, Alaska, 2013
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http://dx.doi.org/10.1016/j.jvolgeores.2012.04.021 Changes in the magma system during the 2008 eruption of Okmok volcano, Alaska, based on GPS measurements, 2010

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http://dx.doi.org/10.1029/2010JB007716