00433nam a2200097Ia 4500082002100000100010800021245015800129260002800287300001500315500000500330 a309.301bUn58.HS aUnited Nations. Economic and Social Affairs, Department of-.Housing, Building and Planning, Centre for- aHuman settlementsbthe environmental challenge; a compendium of United Nations papers prepared for the Stockholm conference on the human environment 1972 aLondonbMacmillanc1975 axiv, 209p. a