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United States ocean territory could expand by an area more than twice the size of California, with most of that in ocean areas off Alaska, under a claim being prepared by the federal government. The U.S. State Department in December announced results of a two-decade program to map the extended continental shelf areas beyond the nation’s 200-mile exclusive economic zone. Much of the focus was on the Arctic Ocean, where bathymetric and geologic surveys by federal agencies produced the first detailed maps of a complex seafloor with a series of c...
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