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The standard, official two letter state abbreviation for Arkansas is AR.
AR [Internet]; Aug 17, 2016 [cited 2016 Aug 17]. Available from: http://www.allacronyms.com/AR. 'AR', All Acronyms, 17 August 2016, <http://www.allacronyms.com/AR> [accessed 17 August 2016] All Acronyms, AR (Aug. 17, 2016, 2:08 PM), available at http://www.allacronyms.com/AR.