000 002960000a22001330004500
245 _aData converters
100 _aClayton, G.B.
260 _aLondon
_bMcMillan
_c1982
300 _aix, 242p. : ill.
020 _a0333294947
080 _a621.377.037.7
_bC6
041 _aEN
942 _cBK
999 _c116618
_d116618