Methods of working coal and metal mines.

Podobné jednotky

• Coal mining : report of the Technical Advisory Committee.
  Vydáno: (1945)
• New coal mining methods that cut costs /
  Vydáno: (1950)
• Surface coal mining technology : engineering and environmental aspects /
  Vydáno: (1981)
• Preliminaries of coal mining; prospecting-explosives-development-drainage-ventilation,
  Autor: Kneeland, Frank H.
  Vydáno: (1926)
• Coal mines : reports of messrs. dunn, dickinson, morton, williams, wynne, and mackworth, inspector of coal mines to Her Majesty's secretary of state.
  Vydáno: (1873)