简介：
简介：~~
50th Anniversary （1956-2006） of the International Association of Hydrogeologists （IAH） - The Association and its Mission
庆祝北京市地质矿产勘查开发局建局50周年
WHYMAP and the World Map of Transboundary Aquifer Systems at the scale of 1：50 000 000（Special Edition for the 4th World Water Forum, Mexico City, March 2006）
