000 00246 a2200073 4500
245 0 _aData Communications :
_bSpreading the Message /
_cSimpson Alan.
710 2 _aInput Two-Nine.
_eWydawca
_4pbl
260 _aPurley, Surrey :
_bInput Two-Nine,
_c1978.
300 _a116 s.;
_c35 cm.
999 _c4774
_d4774