Contributions to the study of coal : A proposed simplification of the Parr unit coal formula /
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| Other Authors: | , , , |
| Format: | Book |
| Language: | English |
| Series: | Report of investigations (Illinois State Geological Survey) ;
no. 32. |
| Subjects: |
| Item Description: | At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey. |
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| Physical Description: | 99 pages : illustrations |