Research needs of Illinois' coal industry : a symposium relating to recovery, preparation, marketing practice, utilization, and basic research presented at quarter centennial celebration of Illinois State Geological Survey, April 30, 1930
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Research needs of Illinois' coal industry : a symposium relating to recovery, preparation, marketing practice, utilization, and basic research presented at quarter centennial celebration of Illinois State Geological Survey, April 30, 1930
（Bulletin / State of Illinois. State Geological Survey, 33 . Cooperative coal mining series）
Illinois Coal Bureau, 1930
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At head of title: State of Illinois Department of Registration and Education, Division of the State Geological Survey
"Illinois mining investigations"
