www.norad.mil/About-NORAD/Canadian-NORAD-Region/
www.fas.org/nuke/guide/usa/airdef/norad-overview.htm
https://treaty-accord.gc.ca/text-texte.aspx?id=105060
www.jstor.org/stable/424829
https://scholarlycommons.law.case.edu/cgi/viewcontent.cgi?article=1381&context=cuslj
www.alchetron.com/Mid-Canada-Line
www.wsj.com/articles/cold-war-era-defense-system-to-get-upgrade-to-counter-russia-china-11614438048
https://en.wikipedia.org/wiki/North_American_Aerospace_Defense_Command
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