Search for: [Subject and Keywords = rock mass preconditioning] OR [Subject and Keywords = hydrofracturing] OR [Subject and Keywords = destress blasting] OR [Subject and Keywords = underground mine] OR [Subject and Keywords = geomechanical hazards] OR [Title = Rock Mass Preconditioning Methods in Underground Mines and Ways of its Evaluation \- state\-of\-the\-art] OR [Creator = Fuławka, Krzysztof] OR [Creator = Szumny, Marcin] OR [Creator = Mertuszka, Piotr]