DIY History | Transcribe | Scholarship at Iowa | 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 223

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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 223

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Plate VI. 1. a,b,c Derbya crassa 73 2. a,b Derbya robusta 76 3. a,b,c Meekella striato costata 77 4. a,b,c,d Chonetis granulifera 79 5. a,b,c Productus costatus 82