000 00247 a2200085 4500
100 1 _aVickery, B.C..
_eAutor
245 0 _aInformation Systems /
_cVickery B.C..
710 2 _aButterworths.
_eWydawca
_4pbl
260 _aLondon :
_bButterworths,
_c1973.
300 _a350 s.;
_c25 cm.
999 _c13191
_d13191