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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 229

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PLATE IX. 1. Aviculopectin occidentalis 116 2. Myalina swallowi 118 3,a,b. " [ditto for Myalina] subquadrata 120 4. " [ditto for Myalina] kansasensis 121 5. Pinna ----- (?) 122 6,a,b. Nucula ventricosa 123
 
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