Columbia subject headings:
Canada--Relations--Mexico.
Mexico--Relations--Canada.
National security--Canada.
National security--Mexico.
Security, International.
Harvard subject headings:
Canada--Relations--Mexico.
Mexico--Relations--Canada.
National security--Canada
National security--Mexico
Security, International
Princeton subject headings:
Canada--Relations--Mexico.
Mexico--Relations--Canada.
National security--Canada.
National security--Mexico.
Security, International.