The third volume of the Invincible Debating Society's minutes contains entries, arranged chronologically, from November 1915 through June 1918. These entries, which start on page 20 and vary in length, usually include the date, a description of the meeting, updates on the Society's activities, and identify members who participated. The first section in this volume includes a typed program for two meetings in 1915 and the Society's membership roll. Pages without content were not photographed. The Minutes of the Invincible Debating Society comprise 3 volumes, which are located at the National Archives and Records Administration, Record Group 75, Series 1339.
Two loose documents were found in this volume, including an undated Roll Call and questions to discuss at meeting in May 1918 .