EPA is revising the format of part 52 of Title 40 of the Code of Federal Regulations (40 CFR part 52) for materials submitted by Nashville-Davidson County that are incorporated by reference (IBR) into the State Implementation Plan (SIP). The regulations affected by this format change have all been previously submitted by the local agency and approved by EPA. This format revision will affect the "Identification of Plan" sections of 40 CFR part 52, by adding a table for the Nashville- Davidson portion of the Tennessee SIP. This revision will also affect the format of the SIP materials that will be available for public inspection at the Office of the Federal Register (OFR), the Air and Radiation Docket and Information Center, and the Regional Office.