promising technologies and research opportunities : report of an ad hoc panel of the Advisory Committee on Technology Innovation, Board on Science and Technology for International Development, Commission on International Relations United States Agency for International Development. Office of Science and Technology. text programmed text dcu 1974 ---- 5 ed. monographic eng vii, 153 p. : il. ; 23 cm. specialized Introduction and summary in English, Arabic, French, and Spanish ABASTECIMIENTO DE AGUA CONSERVACION DEL AGUA REGIONES ARIDAS 333.91 M66 270520 20260521090137.0 000001708