Created on: Oct 18, 2013 Author: mccre004 http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode theme 005 theme https://www.ngdc.noaa.gov/docucomp/48570596-75a0-404f-b4e0-dd8426d57bf8 Codes for the Identification of the States, the District of Columbia, Puerto Rico, and the Insular Areas of the United States