00780nam0-22002651i-450-990000987020403321000098702FED01000098702(Aleph)000098702FED0100009870220000920d1977----km-y0itay50------baengAppropriate technologies for developing countriesprepared by Richard S. EckausWashingtonNational Academy of Sciences1977Problemi energetici00-09Eckaus,Richard S.46500ITUNINARICAUNIMARCBK9900009870204033211H-04111252FI1FI1Appropriate technologies for developing countries353692UNINAING01