1.
|
Champaign, IL (615 E. Peabody Dr., Champaign 61820-6924) : Illinois State Geological Survey, 2001.
|
2.
|
[Springfield, Ill] Department of Mines and Minerals, State of Illinois.
|
3.
|
Champaign, Ill. : Illinois State Geological Survey, 1981.
|
4.
|
Urbana, Illinois State Geological Survey, 1974.
|
5.
|
Urbana : Illinois State Geological Survey, 1979.
|
6.
|
Champaign, IL : Illinois State Geological Survey, [1999]
|
7.
|
Champaign, Ill. : Illinois State Geological Survey, 1988.
|
8.
|
[Champaign, ILL] : Illinois State Geological Survey, 1988.
|
9.
|
Champaign, Ill. : Illinois State Geological Survey, 1982.
|
10.
|
Champaign, Ill. : Illinois State Geological Survey, 1982.
|