Project 90-R, INCITS 38:200x, Information technology - Codes for
the Identification of the States and Equivalent Areas within the United States,
Puerto Rico, and the Insular Areas (Revision of INCITS 38:1988 (R2004))
This standard establishes a structure for the assignment of identifying codes
to states and state equivalents of the United States and its insular areas,
for the purpose of information interchange among data processing systems.