Coal measures and coal mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining
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| Format: | Others |
| Language: | English |
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University of Iowa
1898
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| Online Access: | https://ir.uiowa.edu/etd/3665 https://ir.uiowa.edu/cgi/viewcontent.cgi?article=3668&context=etd |