Coal Fields Coals

Coal Fields Coals

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Bituminous Coal Fields of Pennsylvania pt.1. General information on coal, by G. H. Ashley. 1928. pt.2. Detailed description of coal fields, by J. D. Sisler. 2d ed. 1932. pt.3. Geology of Pennsylvania bituminous coals by J D Sisler . 2 Mining methods and transportation in Pennsylvania by J W Paul . 10 Analyses of delivered coal by N H.

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