E. Donald McKay III ... [and others] ; 51st Midwest Friends of the Pleistocene Field Trip, an ISGS centennial field trip, May 13-15, 2005 ; sponsored by Illinois State Geological Survey
Date
[2005]
Series
Illinois State Geological Survey open file series ; 2005-7
John H. Bullock, Jr... [and others] ; prepared in cooperation with the Kentucky Geological Survey, the Geological Survey Division of the Illinois Department of Energy and Natural Resources, and the Missouri Division of Geology and Land Survey
Date
1991
Series
U.S. Geological Survey open-file report ; 91-637-A