DEVELOPING COUNTRIES Economic conditions 3 Economic history 3 DEVELOPMENT 2 Periodicals 2 AFRICA 1 Condiciones Económicas 1 Condicions econòmiques 1 Credit, Agricultural 1 DEVELOPMENT ASSISTANCE 1 Desenvolupament econòmic 1 Développement économique 1 ECONOMIC DEVELOPMENT 1 ECONOMIC POLICY 1 Economic development 1 Ontwikkelingseconomie 1 Països en vies de desenvolupament 1 Purification 1 SAVINGS 1 Saving and investment 1 Savings 1 Underdeveloped areas 1 WATER QUALITY MANAGEMENT 1 WATER SUPPLY 1 Water 1 Water-supply 1