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arizona.edu
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"Thomas E. Campbell". University of Arizona: The Bisbee Deportation of 1915. 2005. Archived from the original on 2018-01-17. Retrieved 2011-02-09.
"The Arizona State Flag". Arizona State Library, Archives and Public Records Division, Arizona Secretary of State. January 13, 2010. Archived from the original on 2012-12-13. Retrieved 2011-02-09.