The Transactions of the Illinois State Historical Society (which is sometimes known as the Papers and Transactions of the Illinois State Historical Society) include summaries of the meetings of the Society and the text of papers presented at Society meetings. The following volumes are available online:
Index to the Transactions of the Illinois State Historical Library and Other Publications of the Illinois State Historical Library, Volume 1, A - K, Including Publications of the Illinois State Historical Library, Transactions of the Illinois State Historical Society, Papers in Illinois History, and Occasional Publications of the Illinois State Historical Society
Index to the Transactions of the Illinois State Historical Library and Other Publications of the Illinois State Historical Library, Volume II, L-Z, Including Publications of the Illinois State Historical Library, Transactions of the Illinois State Historical Society, Papers in Illinois History, and Occasional Publications of the Illinois State Historical Society
The Transactions are also available in Government Information, Malpass Library, 4th Floor Illinois 977.3 ILLI.