This is the ValueSet that contains codes in both RTPBC Two Letter State and Province Code Value Set (http://hl7.org/fhir/us/carin-rtpbc/ValueSet/rtpbc-state-and-province-code) and RTPBC Two Letter State and Province Code Value Set (http://hl7.org/fhir/us/carin-rtpbc/ValueSet/rtpbc-state-and-province-code).