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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 217

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PLATE III. 1, a, b, c. Japhrentis [?pellaensis?] 17 2, a, b, c, d, e. Spirifer keokuk 28 3, a, b, c, d. Rhynchonella ottumwa 25 4, a, b. Terebratula turgida 26 5, a, b. " [ditto for Terebratula] formosa 32 6, a, b, c, d. Athyris ([?Servinula?]) subquadrata 30 7, a, b, c. Productus marginicinctus 22 8. " [ditto for Productus] ovatus 24 9, a, b. Streptorhynchus umbraculum 21 10, a, b, c. Allorisma marionensis 32 11. Allorisma -- Sp. [?] 12. Schizodus -- Sp. [?] 13. Bellerophon sublaevis 34
 
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