Peng, Syd S., 1939-.
Coal mine ground control / Syd S. Peng. - J. Wiley 1986.
3179
Ground control (Mining).
Coal mines and mining - Safety measures.
TN288 / Pen.
Coal mine ground control / Syd S. Peng. - J. Wiley 1986.
3179
Ground control (Mining).
Coal mines and mining - Safety measures.
TN288 / Pen.