Pipeline accident report : Natural Gas Pipeline Rupture, and Subsequent Explosion, St. Cloud, Minnesota, December 11, 1998 National Transportation Safety Board (NTSB) 2000 Öppna dokument
Pipeline accident report : Natural gas explosion and fire in South Riding, Virginia, July 7, 1998 National Transportation Safety Board (NTSB) 2001 Öppna dokument
Pipeline accident summary report : Natural gas pipeline rupture and fire during dredging of Tiger Pass, Louisiana, October 23, 1996 National Transportation Safety Board (NTSB) 1998 Öppna dokument