00277nam a2200109Ia 4500082002100000100001700021245005200038260005200090300001500142500000500157700000500162  a309.262bM657.SS  aMills, E. S.  aStudies in the structure of the urban economyb  aBaltimorebJohns Hopkins University Pressc1972  axii, 151p.  a  a