On January 26, 1989, we approved the Butte Total Suspended Particulate (TSP) State Implementation Plan (SIP), and on March 11, 1994, we approved the Butte Particulate Matter with an aerodynamic diameter less than or equal to 10 micrometers (PM-10) SIP. The Butte PM-10 SIP replaced the Butte TSP SIP and therefore, EPA is making a correction to remove the Butte TSP SIP from the approved SIP. In addition, on August 13, 2001, EPA approved the recodification and revisions to the Administrative Rules of Montana (ARM). In the regulatory material of the August 13, 2001 rule, EPA inadvertently referenced the wrong date. We are correcting the date in this document. Also, in Federal Register documents published on September 21, 2001, November 15, 2001 and November 19, 2001, we incorporated by reference (IBR) materials that contained omission errors in the text. We are correcting the errors contained in the IBR material.