000 00280pam a2200121a 44500
008 160408b1982 xxu||||| |||| 00| 0 eng d
082 _a511.5
_bOP2G
100 _a
245 1 _aCODES
260 _a
_bOpen University, Milton Keynes
_c1982
964 _gCIRC
997 _aA77935 C
999 _c309602
_d309602