I. Physiographic divisions of the area covered by the Illinoian drift-sheet in southern Illinois. : II. Recent discoveries of Pre-Illinoian drift in southern Illinois /
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| Format: | Book |
| Language: | English |
| Series: | Report of investigations (Illinois State Geological Survey) ;
no. 19. |
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| Physical Description: | 57 pages : illustrations |
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| Bibliography: | Bibliographical foot-notes. |