Non-conventional water resources use in developing countries : proceedings of the interregional seminar, Willemstad, Curacao, Netherlands Antilles, 22-28 April 1985 / United Nations. Department of Technical Co-operation for Development . United Nations. Department of Technical Co-operation for Development . Water resources development. 22 333.91 UNN Bibliography: p. 503 Includes bibliographical references New York : United Nations, 1987. 1987. 1987 Text xvi, 515 p. : eng Natural resources/water series no. ; 22