COAL-MINING BY MECHANICAL APPLIANCES. Available to Purchase

COAL, MINING, MECHANICAL, APPLIANCES, COALFIELDS, ANALYSIS, POWER, MACHINERY, ENGINES, HAULAGE, MINES, WATER, SUPPLY, WATER SUPPLY, WORKING, OUTPUT, WAGES, EQUIPMENT, PLANT, BOILERS, METHODS, ROOM AND PILLAR, PILLAR AND STALL, MACHINES, CAMBRIA, WYOMING, USA, UNITED STATES, CAMBRIA MINING