00287nam a2200109Ia 4500082002000000100003800020245003400058260003100092300001700123500000500140700003200145  a339.23bIs76.RI  aIsard, Walter and Langford, T. W.  aRegional input-output studyb  aCambridgebMIT Pressc1971  axviii, 228p.  a  aLangford, T. W. ; jt. auth.