Contributions to the study of coal. : Influence of structural irregularities upon the chemical character of no. 6 coal in Franklin and Williamson Counties, Illinois /
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| Other Authors: | , |
| Format: | Book |
| Language: | English |
| Series: | Report of investigations (Illinois State Geological Survey) ;
no. 35. |
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| Item Description: | At head of title: State of Illinois. Department of Registration and Education. |
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| Physical Description: | 41 pages : illustrations |