000 00263nam a2200109Ia 4500
008 220201s1969 xx 000 0 eng d
100 _aLarhim, JA
245 0 _aWorth study theory & practice
260 _bLondon:Mc graw hill
_c1969
300 _a246
942 _2ddc
999 _c75744
_d75744