000
003230000a22001330004500
008
151215t1980 xxu||||| |||| 00| 0 eng d
020
_a
0116308184
041
_a
eng
080
_a
004
_b
I6
942
_c
BK
245
_a
Information technology
260
_a
London
_b
Her Majesty's Stationery Office
_c
1980
300
_a
55p.
999
_c
138607]
_d
138607