000 00239nam a2200109Ia 4500
008 230401s9999 xx 000 0 eng d
100 _aRITCHIE (COLIN)
245 0 _aOPERATING SYSTEM
250 _a1998
260 _bBPB
942 _2ddc
_cBTECH
999 _c3105
_d3105