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  2. List of World Heritage Sites in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_World_Heritage...

    Of the 26 sites, 13 are cultural, 12 are natural, and one, Papahānaumokuākea, is mixed, listed for both cultural and natural properties. [3] One site is currently listed as endangered: Everglades National Park was listed in 2010 due to deterioration of its aquatic ecosystems. The site had also been listed as endangered between 1993 and 2007.

  3. List of United States National Historic Landmarks in United ...

    en.wikipedia.org/wiki/List_of_United_States...

    This is a list of National Historic Landmarks in U.S. commonwealths and territories, associated states, and foreign states. Included are lists of National Historic Landmarks (NHLs) and of National Park Service administered areas in U.S. Commonwealths and territories, U.S.-associated states, and in the foreign state of Morocco.

  4. Category:World Heritage Sites in the United States - Wikipedia

    en.wikipedia.org/wiki/Category:World_Heritage...

    Pages in category "World Heritage Sites in the United States" The following 33 pages are in this category, out of 33 total. This list may not reflect recent changes .

  5. National Register of Historic Places - Wikipedia

    en.wikipedia.org/wiki/National_Register_of...

    Old Slater Mill, a historic district in Pawtucket, Rhode Island, the first property listed in the National Register, on November 13, 1966 [1] George B. Hartzog Jr., director of the National Park Service from 1964 to 1972 [2] U.S. Secretary of the Interior Cecil Andrus, who removed the National Register from the jurisdiction of the National Park Service in 1978

  6. List of World Heritage Sites in North America - Wikipedia

    en.wikipedia.org/wiki/List_of_World_Heritage...

    Below is a list of the UNESCO World Heritage Sites located in upper North America. Greenland has been included here as part of North America despite its cultural and political associations with Europe. The separate List of World Heritage Sites in Central America covers the continental areas further south. Mexico leads North America hosting 35 ...

  7. Radio Research Laboratory (Harvard) - Wikipedia

    en.wikipedia.org/wiki/Radio_Research_Laboratory...

    The Radio Research Laboratory (RRL), located on the campus of Harvard University, was an 800-person secret research laboratory during World War II.Under the U.S. Office of Scientific Research and Development (OSRD), it was a spinoff of the Radiation Laboratory (Rad Lab) at MIT and set up to develop electronic countermeasures to enemy radars and communications, as well as electronic counter ...