00309    a2200121   4500020001500000082001500015100001600030245003300046260003600079300002100115650003300136700001800169  a0043381529  a338.5bELS  aElse, Peter  aPrinciples of microeconomics  aBostonbUnwin hymanc1990g1990  aXVI, 385p.c23cm  aGENERAL PRODUCTION ECONOMICS  aCurwen, Peter