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"Top 30 Aspen Outdoor Activities". Trip Advisor.14/09/2015. < http://www.tripadvisor.com.au/Attractions-g29141-A ctivities-Aspen_Colorado.html#TtD >
"Glaciers- Rocky Mountains". National Park Service. 2015.12/09/2015. < http://www.nps.gov/romo/learn/nature/glaciers.htm >
"Top 30 Aspen Outdoor Activities". Trip Advisor.14/09/2015. < http://www.tripadvisor.com.au/Attractions-g29141-A ctivities-Aspen_Colorado.html#TtD >