"Ground control (Mining) Arizona." . . "Structural analysis of a mechanized LHD trench undercut caving system"@en . "Structural analysis of a mechanized LHD trench undercut caving system" . . . . . . . . . . . . . . . . . . . . . . . . . . . "Rock mechanics Arizona." . . "Ground control (Mining)" . . "Caving mining." . . "Rock mechanics." . . . . "Arizona." . . "United States. Bureau of Mines." . .