科学技术类搜索引擎及目录索引

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地球科学 Earth Sciences：

子类：

Earth Science - Link directory.

GeoSearch - Geology and rockhound search engine.

Links to Earth-Science Resources - A commented list of links to a selection of the best Earth-Science resources on the Internet.

My Top Link - Earth sciences, geology, and mining.

WWW Virtual Library: Earth Sciences