00925nam0-22002891i-450-99000750041040332120051025100256.0000750041FED01000750041(Aleph)000750041FED0100075004120030814d1957----km-y0itay50------baengUSNew sources of energy and economic developmentsolar energy, wind energy, tidal energy, geothermic energy and thermal energy of the seasNew YorkUnited nations1957150 p.30 cmRisorse energeticheEconomiaUnited Nations. Department of Economic and Social Affairs142247ITUNINARICAUNIMARCBK990007500410403321C-03-202Ist.6203ILFGEILFGENew sources of energy and economic development676340UNINA