Peng, Syd S.
Longwall mining - 1st ed. - New York John Wiley & Sons 1984 - x, 708 p. ill. 24 cm.
0471868817
Coal Mining
622.334 / PEN/1964
Longwall mining - 1st ed. - New York John Wiley & Sons 1984 - x, 708 p. ill. 24 cm.
0471868817
Coal Mining
622.334 / PEN/1964