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 66

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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 66

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65. pentagonal supported on the broad borders of first radials. Surface smooth, division between plates well marked. Geol. Pos. and Loc. - Coal Measures near Springfield Illinois Reference. - Final Rept. U.S. Geol. Sur. Nebraska, page 146.