N. Ministry o NL,
«Abastecimiento de agua potable, previsiones sanitarias, drenaje y eliminacion de residuos en paises en desarrollo : apunte sectorial». Netherlands, Ministry of Foreign Affairs, DGIS, Information Department, The Hague, The Netherlands, p. 22 p., 1989.
D. General fo DGIS,
«Drinking water supply, sanitary facilities, drainage and waste disposal in developing countries : sector memorandum». Netherlands, Ministry of Foreign Affairs, DGIS, Information Department, The Hague, The Netherlands, p. 20 p., 1989.
N. Ministry o NL,
«Drinkwatervoorziening, sanitaire voorzieningen, drainage en afvalverwijdering in ontwikkelingslanden : sektornotitie». Netherlands, Ministry of Foreign Affairs, DGIS, Information Department, The Hague, The Netherlands, p. 23 p., 1989.
D. General fo DGIS,
«Environment and development». Netherlands, Ministry of Foreign Affairs, DGIS, The Hague, The Netherlands, p. 43 p.: fig., photogr., 1989.
N. Ministry o NL,
«L'approvisionnement en eau potable, les installations sanitaires, le drainage et l'evacuation des dechets dans les pays en voie de developpement : rapport sectoriel». Netherlands, Ministry of Foreign Affairs, DGIS, Information Department, The Hague, The Netherlands, p. 21 p., 1989.