EPA is taking direct final action approving State Implementation Plan (SIP) revisions submitted by the State of Montana on August 25, 2004. The revisions are to the Administrative Rules of Montana and correct internal references to state documents; correct references to, or update citations of, Federal documents; and make minor editorial changes. The intended effect of this action is to make federally enforceable those provisions that EPA is approving. This action is being taken under section 110 of the Clean Air Act.