Long-term planning of water management proceedings of the Seminar on Long-Term Planning of Water Management, Zlatni Piasatzi, Bulgaria, 17-22 May 1976. - Seminar on Long-Term Planning Management Zlatni Pyasutsi, Bulgaria 1976.; United Nations. Economic Commission for Europe (New York United Nations, 1976)
At head of title: Economic Commission for Europe
Keywords: Water resources development -- Congresses