What does USRK stand for?

MLA style: "USRK." Acronym Finder . 2012. AcronymFinder.com 4 Jun. 2012 http://www.acronymfinder.com/Usage_Specific-Root-Keys-(USRK).html
Chicago style: Acronym Finder . S.v. "USRK." Retrieved June 4 2012 from http://www.acronymfinder.com/Usage_Specific-Root-Keys-(USRK).html
APA style: USRK. (n.d.) Acronym Finder. (2012). Retrieved June 4 2012 from http://www.acronymfinder.com/Usage_Specific-Root-Keys-(USRK).html

Usage-Specific Root Keys

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