• US DOE Energy Efficiency and Renewable Energy (EERE)
  
  The U.S. DOE Energy Efficiency and Renewable Energy Web site provides information on energy efficiency and renewable energy technologies.
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• USA.gov
  The U.S. Government's Official Web Portal
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• USA.gov: The U.S. Government's Official Web Portal
  Official information and services from the U.S. government
  USA.gov: Home page of the U.S. Government's Official Web Portal for all government transactions, services, and information. It provides direct online access to federal, state, local, and tribal governments.
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  in Public bookmarks with country databases directories liberal-studies societies us-government 國家 目錄 社會 美國政府 資料庫 通識 by 41 users

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