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    • Power Production in the United States - Nature

      Nature· 18 hours ago

      THE chief sources of energy to-day in the United States are coal and petroleum, which between them account for more than 90 per cent of the demand, water power supplying only 10 per cent. A ...

    • Indians of the South-Eastern United States - Nature

      Nature· 19 hours ago

      The historical Indian tribes of the south-eastern United States are diverse in language, but they share so many important characteristics that they form a cultural province. This is illustrated ...

    • Radioactive Standards - Nature

      Nature· 15 hours ago

      These standards will ultimately be deposited at, and certified by, the National Bureau of Standards at Washington, D.C., to be issued ...