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This photo of historian Mark Arnold was taken by the Wikimedia Commons user Gazebo <https://commons.wikimedia.org/wiki/User:Gazebo> on May 5, 2012 and is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. For more information about this license, please visit <http://creativecommons.org/licenses/by-sa/3.0/> on the Web or write to Creative Commons, PO Box 1866, Mountain View, CA 94042 USA.