000			003110000a22001210004500
245			_aOpen pit mine planning and design
100			_aCrowford, J.T., ed.
100			_aHustrulid, William A., ed.
260			_bSociety of Mining Engineers of AIME _c1979
080			_a622.2 _bC7
041			_aEN
942			_cBK
999			_c115951 _d115951