Proceedings of the 23rd Forum on the Geology of Industrial Minerals, May 11-15, 1987, North Aurora, Illinois /
Randall E. Hughes and James C. Bradbury, editors.

APA Citation

Forum on Geology of Industrial Minerals (23rd : 1987 : North Aurora, I., Bradbury, J. C., Hughes, R. E., Illinois State Geological Survey. (1989). Proceedings of the 23rd Forum on the Geology of Industrial Minerals, May 11-15, 1987, North Aurora, Illinois. Champaign, IL: Illinois State Geological Survey.

MLA Citation

Forum on Geology of Industrial Minerals (23rd : 1987 : North Aurora, Ill.), James C Bradbury, Randall E Hughes, and Illinois State Geological Survey. Proceedings of the 23rd Forum On the Geology of Industrial Minerals, May 11-15, 1987, North Aurora, Illinois. Champaign, IL: Illinois State Geological Survey, 1989.