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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 219

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PLATE IV. 1. Fusulina cylindrica 42 2,a,b,c,d. Campophyllum torquium 47 3,a,b. Axophyllum rude 49 4,a,b. Lophophyllum proliferum 46 5,a,b,c. Baryphyllum aplatum 45 6,a,b. Syringopora multattennata 52 7. Michelina eugenia 51
 
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