000 00265nam a2200109 a 4500
003 EIA
001 10087
942 _02
_2ddc
_cBK
245 _aExcavation systems :
_bplanning, design, and safety
008 141112s1981 ck r 000 u spa d
082 _a624.152
_bT944
999 _c5674
_d5674