00469nam a22001217a 4500008004100000020001800041040005500059080002000114245012800134260005800262300001500320650001200335230608b        |||||||| |||| 00| 0 eng d  a0-87849-059-0  aNational Science LibrarycNational Science Library  a622(082.2) bM7  aMining science & technology c/ Proceedings of the International Symposium on Mining Technology and Science, September 1985  aChina: bChina Coal Industry publishing House, c1987  aix, 1413p.  aGeology