Not a dirty word : Environment /

The latest U.N. assessment is that 1.1 billion people live without access to clean drinking water and more than twice that number is denied hygienic means of sanitation...

书目详细资料

主要作者:	TVE International
企业作者:	Ace communications
格式:	电子 影片 软件
语言:	英语
出版:	Nairobi Kenya : ACE communications, 1990.
版:	TVE international.
主题:	Sanitation. sewage disposal. water quality.
标签:	添加标签 没有标签, 成为第一个标记此记录!