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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 177

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[page]176.[/page] surely be found. Again there are often more than three seams. At one place in Polk County there are twelve distinct coal horizons varying in thickness from mere films to workable coal. When several seams do occur their relation to each other is very variable. They are not usually immediately one above another, but usually one overlaps another as indicated in figure 4, from [image: sketch of overlapping/nested coal seams] [caption]Figure 4.[/caption] which it readily can be seen that a boring made in such a field may strike one two or three seams of coal according to the exact location of the boring. There is, in Iowa, one notable
 
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