Coal resources of district VII (Southwestern Illinois) : coal no. 6 West of Duquoin anticline
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Coal resources of district VII (Southwestern Illinois) : coal no. 6 West of Duquoin anticline
（Bulletin / State of Illinois. State Geological Survey, 11 . Cooperative mining series）
Printed by authority of the State of Illinois, 1922
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At head of title: State of Illinois, Department of Registration and Education, Division of the State Geological Survey
Includes index