Hur påverkar ett Natomedlemskap civilt försvar? : Perspektiv från Norge och Danmark Myndigheten för samhällsskydd och beredskap (MSB) 2024 Öppna dokument
Aircraft accident report : crash during landing federal express, Inc. McDonnell Douglas MD-11, N611FE Newark international airport Newark, New Jersey July 31, 1997 National Transportation Safety Board (NTSB) 2000 Öppna dokument
Aircraft accident report : Uncontrolled descent and collision with terrain United Airlines flight 585, Boeing 737-200, N999UA 4 miles south of Colorado Springs municipal airport National Transportation Safety Board (NTSB) 2001 Öppna dokument
Railroad accident report : collision involving three consolidated rail corporation freight trains operating in fog on a double main track near Bryan, Ohio, January 17, 1999 National Transportation Safety Board (NTSB) 2001 Öppna dokument