Pipeline accident report : San Juan Gas Company, inc./Enron corp, propane gas explosion in San Juan, Puerto Rico, on November 21, 1996 National Transportation Safety Board (NTSB) 1997 Öppna dokument
Railroad accident report : derailment of Burlington northern and Santa Fe company intermodal freight train S-CHILAC1-31, Crisfield, Kansas, september 2, 1998 National Transportation Safety Board (NTSB) 2000 Öppna dokument
Conference proceedings : International round-table on Extreme space weather: Geomagnetic storms, GNSS disruptions and the impact on vital functions in society, Stockholm, 5-6 september 2012 Myndigheten för samhällsskydd och beredskap (MSB) 2012 Öppna dokument