A Treatise on Coal Mining, Vol. 2: Prepared for Student of the International Correspondence Schools, Scranton, Pa.; Economic Geology of Coal; Prospecting for Coal, Shafts, Slopes, and Drifts; Methods of Working Coal Mines; Mechanics; Steam and Steam Boile
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A Treatise on Coal Mining, Vol. 2: Prepared for Student of the International Correspondence Schools, Scranton, Pa.; Economic Geology of Coal; Prospecting for Coal, Shafts, Slopes, and Drifts; Methods of Working Coal Mines; Mechanics; Steam and Steam Boile
