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  • U.S. Department of Education

    U.S. Department of Education

    U.S. Department of Education www.ed.gov

    - 2014-02-04 - 收藏
  • U.S. Department of State

    U.S. Department of State

    U.S. Department of State Department Of State. The Office of Electronic Information, Bureau of Public Affairs

    - 2014-02-04 - 收藏
  • Department of Energy美国能源部

    Department of Energy美国能源部

    Department of Energy www.energy.gov美国能源部

    - 2014-02-04 - 收藏
  • Welcome to the USGS - U.S. Geological Survey

    Welcome to the USGS - U.S. Geological Survey

    Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment.

    - 2014-02-04 - 收藏
  • Exploratorium

    Exploratorium

    San Francisco's Exploratorium is more than a museum, it's a twenty-first-century learning laboratory, an eye-opening, always-changing, playful place to explore and tinker. Dive in and discover what we’re all about.

    - 2014-02-04 - 收藏
  • Bureau of Reclamation Homepage

    Bureau of Reclamation Homepage

    Bureau of Reclamation Homepage www.usbr.gov Department of the Interior, Bureau of Reclamation Homepage, Water, Dams, Dam, Projects & Facilities, Hydromet, Agrimet, hydropower

    - 2014-02-04 - 收藏
  • Aquarium of the Bay

    Aquarium of the Bay

    San Francisco Bay's Aquarium | Aquarium of the Bay www.aquariumofthebay.org

    - 2014-02-04 - 收藏
  • Niagara Falls State Park | Official Site

    Niagara Falls State Park | Official Site

    Discover Niagara Falls State Park. With the breathtaking Falls, Hurricane Decks, the Maid of the Mist and more, a Niagara Falls vacation is the ultimate getaway.

    - 2014-02-04 - 收藏
  • 美国中央公园

    美国中央公园

    美国中央公园Your Complete Guide to New York City\'s Central Park | CentralPark.com www.centralpark.com

    - 2014-02-04 - 收藏
  • Amazon.com

    Amazon.com

    Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry, tools & hardware, housewares, furniture, sporting goods, beauty & personal care, broadband & dsl, gourmet food & just about anything else.

    - 2014-02-04 - 收藏