00614nam a2200133Ia 4500008004100000040001700041082002300058110005100081245015500132260003500287300001200322440001700334650012900351190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta333.91bU58L  aUnited Nations. Economic Commission for Europe 0aLong-term planning of water managementbproceedings of the seminar on long-term planning of water management, Zlatni Piasatzi (Bulgaria)17-22 May 1976  aNew YorkbUnited Nationsc1976  a3v. V.p  aECE/Water/15  aWater quality-Management; Water resources development; Water conservation; Water resources development-Environmental aspects