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Illinoian and Wisconsinan Stratigraphy and Environments in Northern Illinois
Midwest Friends of the Pleistocene. Field ConferenceIllinois State Geological Survey
其他書名
The Altonian Revised
出版Illinois Department of Energy and Natural Resources, State Geological Survey Division, 1985
URLhttp://books.google.com.hk/books?id=DC7d8Su3d3oC&hl=&source=gbs_api