000 00256nam a22001097a 4500
082 _a330
_bRUP
245 _aPrinciples of economics
_cRoy J. Ruffin
260 _an.p
_bn.p.
_cn.d.
300 _axxxii, 798p.
650 _aEconomics
_9208004
942 _cBK
999 _c154194
_d154194