1.
|
Urbana : Illinois State Geological Survey, c1970.
|
2.
|
Urbana, Illinois State Geological Survey, 1959.
|
3.
|
|
4.
|
|
5.
|
Urbana, Illinois State Geological Survey, 1968.
|
6.
|
|
7.
|
|
8.
|
Champaign, Ill. : Dept. of Energy and Natural Resources, Illinois State Geological Survey, [1992].
|
9.
|
Urbana : Illinois State Geological Survey, 1955.
|