April 20, 2012 Archives 
RealClearHistory Morning Edition
Making Sense of Robert E. Lee - Roy Blount Jr., SmithsonianFrom Rage to Bloodshed at Columbine - Fiona Steel, Crime Library
The Truth About Columbine - Andrew Gumbel, The Guardian
The Inconspicuous Birth of Adolf Hitler - History Place
The Final Days of Adolf Hitler - Rob Broomby, BBC News
Red Baron: Great War's Greatest Pilot - Stephen Sherman, Ace Pilots
Inside the Red Baron's Mind - Peter Tyson, PBS
Korean Air and the Cold War - Andrew Farrell, TESL Korea News
Deepwater Horizon v. Exxon Valdez - Katherine Unger, Wildlife Society
10 Greatest Moments in Fenway History - Matt Snyder, CBS Sports