Physiographic divisions of the area covered by the Illinoian drift-sheet in southern Illinois Recent discoveries of Pre-Illinoian drift in southern Illinois
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Physiographic divisions of the area covered by the Illinoian drift-sheet in southern Illinois . Recent discoveries of Pre-Illinoian drift in southern Illinois
（Report of investigations, no. 19）
Printed by Authority of the State of Illinois, 1929
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Recent discoveries of Pre-Illinoian drift in southern Illinois
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At head of title: State of Illinois, Department of Registration and Education, Division of the State Geological Survey