Notes: | At head of title: no. 1-15, Illinois coal mining investigations, cooperative agreement; no. 16-18, State of Illinois. State Geological Survey; no. 19- State of Illinois. Department of Registration and Education ... Division of the State Geological Survey ... No. 1 (Preliminary report on organization and method of investigation) published without series title or number. Prepared under a cooperative agreement between the Illinois State Geological Survey Division, the Engineering Experiment Station of the University of Illinois (no. 1-13, Department of Mining Engineering, University of Illinois) and (no. 1-30) the U.S. Bureau of Mines.
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