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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 235

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PLATE XII 1,a,b,c. Orthoceias rushensis 161 2,a,b,c,d. " [ditto for Orthoceias] cribiosum 162 3. Nautilus occidentalis 163 4. " [ditto for Nautilus] missouriensis 164 5,a,b,c,etc. Archaeocidaris (parts) 58 6,a,b. Zeacrinus microspinus (spines) 60 7,a,b. " " [ditto for Zeacrinus microspinus] (plates) 60 8,a. Eupachycrinus verucosus (plates) 62 8,b. " " [ditto for Eupachycrinus verucosus] (calyx) 62 9 Erisocrinus typus (calyx) 64 10,a. Phillipsia major (head) 168 10,b. " " [ditto for Phillipsia major] (pygridium) 168 10,c. " " [ditto for Phillipsia major] (glabella) 168.
 
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