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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 212

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Timbering the [?entries?] 197 " " [ditto for Timbering the] shaft 189 Tractive forces 200 Tramways 200 Trigonia rugosa 92 Trigonidae 126 Trilobita 166 Turbo tabulata 138 Unconformity of Lower and Upper Carboniferous 1 Uneven floor of coal 173 Upper Carboniferous Series 1-35 Ventilation of mine 192-201 Warsaw beds 9 Water in mines 186 Weighing the coal 204 Zaphrentidae 17 Zaphrentis pellaensis 17 " [ditto for Zaphrentis] spinulifera 18 " [ditto for Zaphrentis] spinulosa 18 Zeacrinus microspinus 60.
 
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