The educational extension program of the Illinois State Geological Survey.
| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
Urbana,
[publisher not identified] ;
1948.
|
| Series: | Circular (Illinois State Geological Survey) ;
142. |
| Subjects: |
| Item Description: | Cover title. "Reprinted from School science and mathematics, volume 48, number 2, pp. 139-142, February, 1948." |
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| Physical Description: | 139-142 pages |