First Day Cover
首日封
Sobrescrito de 1.º Dia
ChinaWorld Water Day
Date of Issue : 22 March 2013
To raise people's awareness of protecting water resources, on 18 January 1993, the 47th United Nations General Assembly declared 22 March as World Day for Water in accordance with the proposal made in Agenda 21 of the United Nations Conference on Environment and Development. World Water Day has been observed on 22 March since 1993. 22 March 2013 is the 20th World Water Day.
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