Series contains source material and drafts associated with Sheridan's academic writings on William Quantrill's raid of Lawrence, Kansas during the Civil War. Includes materials related to "William Clarke Quantrill and the Civil War Raid on Lawrence, Kansas, August 21, 1863: An Eyewitness Account by Reverend Richard Cordley," "Emporians in Quantrill's Raid on Lawrence, Kansas," and "Quantrill and the Lawrence Massacre: A Reader," among other works.