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On the methods of working and ventilating the coal-mines of the north of England
with reference to the accidents that occur in such mines from the explosion of firedamp -
Reports upon the West Hazleton and Cattawissa Falls, and the East Mahanoy coal and iron estates
situate in Luzerne and Schuylkill counties, Pa., containing eleven thousand acres, extending eight miles from north to south, and crossing the Mahanoy, the Beaver Meadow and summit, the Hazleton and the Black Creek coal fields