Add to ORKGPrepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering of the University of Illinois, and U.S. Bureau of Mines.Field work by S.O. Andros and J.J. Rutledge
On cover: vol. 1 no. 4.Prepared under a cooperative agreement between State Geological Survey, Dept....
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering,...
Illinois mining investigations prepared under a cooperative agreement between the Illinois State Geo...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering,...
Prepared under a cooperative agreement between the Illinois State geological survey division, the En...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
On cover: vol. 1 no. 4.Prepared under a cooperative agreement between State Geological Survey, Dept....
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering,...
Illinois mining investigations prepared under a cooperative agreement between the Illinois State Geo...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering,...
Prepared under a cooperative agreement between the Illinois State geological survey division, the En...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering ...
On cover: vol. 1 no. 4.Prepared under a cooperative agreement between State Geological Survey, Dept....
Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering,...
Illinois mining investigations prepared under a cooperative agreement between the Illinois State Geo...