DOWDING,C.H
ROCK MECHANICS IN PRODUCTIVITY AND PROTECTION TWENTY FIFTH SYMPOSIUM ON ROCK MEC - NEW YORK SOCIETY OF MINING ENGINEERS 1984 - 24X17
622.2 D745
ROCK MECHANICS IN PRODUCTIVITY AND PROTECTION TWENTY FIFTH SYMPOSIUM ON ROCK MEC - NEW YORK SOCIETY OF MINING ENGINEERS 1984 - 24X17
622.2 D745