The Hemisphere: Earlier Warning

U.S. and Canadian defense officials gave a guarded glimpse last week of a new system of electronic detection stations designed to protect North America's heartland from Soviet air attack. The new line, lying "generally to the north of the settled territory in Canada," would provide earlier warning of intruding aircraft than the Pinetree Chain of interlocking radar stations, already in operation from coast to coast above the Canadian border.

Best guess was that the new stations will employ robot-controlled electronic devices. Since it is not necessary to man every station of the system, its cost should be far less than that of...

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