000 00304nam a2200121Ia 4500
008 220201s1971 xx 000 0 eng d
082 _a339
_bPET
100 _aPeterson (Willis . L)
245 0 _aPrinciples of Economics Macro
260 _bReference ichard D.Irwin
_c1971
300 _a257p.
942 _2ddc
999 _c1870
_d1870