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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 221

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Plate V. 1. a,b. Fistulifora modulifera 55 2 Chaetetes milleporaceus 3 Rhombofora lepidodendroides 67. 4. a,b Lingula mytiloides 70 5 Orbiculoidea nitida 71.
 
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