vol. XV, no. 1. Papers read before the Lancaster County Historical Society : January 6, 1911 (The general position of Lancaster County in Negro slavery ; Minutes of January meeting ; In memoriam ; Officers of the society for 1911 ; Secretary's report ; Librarian's report ; Treasurer's report)
vol. XV, no. 2. Papers read before the Lancaster County Historical Society : February 3, 1911 (Lancaster County's relation to slavery ; Minutes of February meeting)
vol. XV, no. 3. Papers read before the Lancaster County Historical Society : March 3, 1911 (The early abolitionists of Lancaster County ; Minutes of March meeting)
vol. XV, no. 4. Papers read before the Lancaster County Historical Society : April 7, 1911 (The underground railroad ; Reminiscence of Langdon Cheves ; An anti-slavery reminiscence ; Minutes of April meeting)
vol. XV, no. 5. Papers read before the Lancaster County Historical Society : May 5, 1911 (Sidelights on slavery ; The attitude of James Buchanan (A citizen of Lancaster County) towards the institution of slavery in the United States ; Minutes of May meeting)
vol. XV, no. 6. Papers read before the Lancaster County Historical Society : June 2, 1911 (Thaddeus Stevens and slavery ; Minutes of June meeting)
vol. XV, special supplementary no. Papers read before the Lancaster County Historical Society : June 30, 1911 (The Christiana riot : its causes and effects, from a southern standpoint ; Minutes of special meeting)
vol. XV, no. 7. Papers read before the Lancaster County Historical Society : September 1, 1911 (The position of Lancaster County on the Missouri Compromise ; Who was Jacob Hibshman, the congressman from Lancaster County? ; Autograph letters ; Minutes of September meeting ; Minutes of special meeting)
vol. XV, special announcement. Papers of the Lancaster County Historical Society : August 4, 1911 (The commemoration of the "Christiana riot" and the "Treason trials" of 1851 ; On Saturday, September 9, 1911)
vol. XV, no. 8. Papers read before the Lancaster County Historical Society : October 6, 1911 (Report of Committee on the Commemoration of the Christiana Riot and Treason Trial of 1851 ; Minutes of October meeting ; The Christiana riot and the treason trials of 1851 (An historical sketch))
vol. XV, no. 9. Papers read before the Lancaster County Historical Society : Friday, November 3, 1911 (The slavery question during the terms of office of John Whitehill and Robert Jenkins, Lancaster County congressmen ; The Whitehills and Robert Jenkins in Congress ; Minutes of November meeting)
vol. XV, no. 10. Papers read before the Lancaster County Historical Society : Friday, December 1, 1911 (Thaddeus Stevens' attitude towards the Omnibus Bill ; The newspapers on the Christiana riot ; Minutes of December meeting)
The Christiana riot and the treason trials of 1851 : an historical sketch / by W.U. Hensel.