Email Address * *
Name
Subject *
Message * Gases Met with in Mines ; Mine Ventilation ; Economic Geology of Coal ; Prospecting for Coal and Location of Openings ; Shafts, Slopes and Drifts ; Methods of Working Coal Mines ; Electric Hoisting and Haulage ; Electric Pumping, Signaling and Lighting ; - 1295003848 - 9781295003846