Research and service of the Illinois State Geological Survey.- Urbana, IL.- 23 S.: Ill.
| 1. Verfasser: |
Frye, John C.
|
|---|---|
| Ort/Verlag/Jahr: |
1970.
|
| Schlagworte: | |
| Enthalten in: |
Illinois State Geological Survey <Urbana-IL>: annual report of the Department of Registration and Education; July 1, 1968 - June 30, 1969 |
