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1 | Environmentally sound technology for sustainable development / Department of Economic and Social Development . — New York : United Nations, 1992. — 268 p. : gráf., tab. ; 28 cm. — | ![]() |
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1 | Environmentally sound technology for sustainable development / Department of Economic and Social Development . — New York : United Nations, 1992. — 268 p. : gráf., tab. ; 28 cm. — | ![]() |