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Coal and coke mixtures as water-gas generator fuel
Use of bituminous coal in househeating furnaces
Falls of roof and coal in bituminous coal-mines
Bituminous coal as generator fuel for large water-gas sets with waste-heat boilers
Value of bituminous coal and coke for generating steam in a low-pressure cast-iron boiler
Falls of roof in bituminous coal mines :influence of the seasons and rate of production