000 002430000a22001090004500
082 _a330
_bL36
100 _aLipsey, Richard G.
245 _aAn introduction to positive economics
260 _aLOndon
_bELBS
_c1963
300 _aix,559
650 _aEconomics
942 _cLM
999 _c4546
_d4546