English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.
"sixty-eighth." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/sixty-eighth>.
sixty-eighth. (n.d.). Retrieved October 15th, 2018, from http://www.yourdictionary.com/sixty-eighth
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