Information about the Cannelton Crash:,-86.633008

Information about the Electra Design Defect:

Official Lockheed page on the L188 Electra:

Additional information on the L188 Electra & P3 Orion:

Desktop model of a Northwest Electra:

Additional information on the Allison 501-D (T56):

Other relevant links:
"Northwest Airlines: The First Eighty Years", by Geoff Jones,+1960&source=gbs_navlinks_s

NORTHWEST AIRLINES, INC.: An Inventory of Its Corporate Records at the Minnesota Historical Society:

March 17, 2009 Emergency Management Higher Education Program Notes:,%202009.doc

Additional references used:
1. "Airpower" magazine May 2003. "Electra!"
2. "Tell City News" page 1, 2, 7, 8 - March 25, 1960
3. "Air Disaster, Volume 4", by Macarthur Job. Chapter 13,"The Lockheed Electra Saga"