000			00304nam a2200133Ia 4500
008			160710s1999 xx 000 0 und d
020			_a0080430139
082			_a624.1513 SIN
100			_aSINGH,B.
245			_aROCK MASS CLASSIFICATION
260			_bELSEVIER _c1999
300			_a267
942			_2ddc _cB
999			_c61140 _d61140