000 00274 a2200121 4500
001 63109
082 _a004 WAL
090 _c37276
_d37276
100 _aWalker, Roger S
245 _aUnderstanding Computer Science
_hEnglish
260 _bRadio Shack
_c1981
300 _a200p
942 _aCAE NUST
_k004 WAL
999 _c298182
_d298182