00313nam a2200121Ia 4500008004100000040002500041082001400066100002100080245003000101250001900131260003300150300000800183230627s9999    xx            000 0 und d  aNORSU-SiacNORSU-Sia  a339.3 M31  aMansfield, Edwin 0aPrinciples of economics    aFourth Edition  bW.W. Norton & Company c1983  a456