|Britannica Junior Encyclopedia for Boys and Girls. Encyclopedia Britannica, Inc., 1976|
|Edgar McInnis. The North American Nations. Toronto: J.M. Dent & Sons (Canada) Ltd., 1963.|
For a very comprehensive history, see The Dew Line.
|1957 Encyclopedia Year Book. The Story of Our Time. The Grolier Society, Inc.|
"A controversy also developed between the United States and Canada over
the cleanup of deactivated Canadian DEW Line sites. The stations had
produced large amounts of hazardous waste that had been abandoned in the
high Arctic. Especially damaging were the large quantities of PCBs.
While the United States insisted that it was Canada's responsibility to
clean up the sites they had managed, the Canadian government disagreed.
In 1996, an agreement was reached that saw the United States contribute
$100 million to the estimated $600 million cleanup effort. The cleanup
is now underway, site by site."
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