AA flexible helical rock boltA flexible helical rock boltde Clarence O BabcockMateriasRock boltsEdiciones (1)A flexible helical rock bolt (1978)Dept. of the Interior, Bureau of Mines · inglésMás obras de Clarence O BabcockRResults of Research to Develop Guidelines for Mining Near SuResults of Research to Develop Guidelines for Mining Near Surface and Underground Bodies of WaterVer todas las obras de Clarence O Babcock →
RResults of Research to Develop Guidelines for Mining Near SuResults of Research to Develop Guidelines for Mining Near Surface and Underground Bodies of Water