Section 52.1100 - Original identification of plan section(a) This section identifies the original "Air Implementation Plan for the State of Maryland" and all revisions submitted by Maryland that were federally approved prior to November 1, 2004. The information in this section is available in the 40 CFR, part 52, Volume 2 of 2 (§§ 52.1019 to the end of part 52) editions revised as of July 1, 2005 through July 1, 2011, and the 40 CFR, part 52, Volume 2 of 3 (§§ 52.1019 to 52.2019 ) edition revised as of July 1, 2012. 78 FR 33984 , June 6, 2013