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1by 17989 SNAMPROGETTI, ROMA (ITALIA), 13443 META SYSTEMS, CAMBRIDGE, MASS. (EUA), 14859 MONTREAL ENGINEERING CO., MONTREAL (CANADA), 14952 National Academy of Sciences, Washington, D.C. (EUA), 35969 International Workshop on Energy Survey Methodologies for Developing Countries, Jekyll Island, Ga. (EUA), 21-25 Ene 1980bibliotecaIICA