00320nam a2200121Ia 4500082002300000100001900023245005000042260004300092300001500135490003800150500000500188700000500193  a338.6042bSi571.RE  aSiebert, Horst  aRegional economic growth; theory and policyb  aScrantonbInternational Textbookc1969  axiv, 217p.  aInternational series in Economics  a  a