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1 Urban Ecosystems 未开放资源 机器抓取
  Urban Ecosystems is an international journal devoted to scientific investigation of the ecology of urban environments, and policy implications. The scope is broad, including intera...
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2 USGS--Science for a changing world 开放资源 馆员登记
  The USGS is a science organization that provides impartial information on the health of our ecosystems and environment, the natural hazards that threaten us, the natural resources ...
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