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1 Virtual Atlas of Opaque and Ore Minerals in their Associations 开放资源 机器抓取
  This site provides over 400 full colour photomicrographs of the major ore-forming associations and opaque minerals in non-mineralized rocks. It describes typical examples of each m...
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2 Virtual Cave 开放资源 机器抓取
  From the comfort of your keyboard, browse the wonders of the underground! As a caver and photographer for over 35 years, I've shot photos in caves all over the world. This site tel...
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3 virtual field herbarium 开放资源 馆员登记
  a diverse collection of images and data aimed at helping researchers identify tropical plant species,by The Oxford Plant Systematics and Diversity research group ;...
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4 Virtual Geography Texts 开放资源 机器抓取
  The aim of the VGT is to present teaching materials about Canada and Germany. The general structure of the VGT consists of four modules with a somewhat similar thematic and formal....
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5 Visible Earth: A catalog of NASA images and animations of our home planet 开放资源 机器抓取
  This web site provides a subject-indexed and searchable list of thousands of images, visualizations, and animations of the Earth based on satellite data. Images relating to the fol...
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