Columbia subject headings:
Harvard subject headings:
Border security--Greece--21st century.
Emigration and immigration--21st century.
IS (Organization)
Islam--Greece--21st century.
National security--Greece--21st century.
Terrorism--Greece--21st century.
Princeton subject headings:
Border security--Greece--21st century.
Emigration and immigration--Greece--21st century.
IS (Organization)
Islam--Greece--21st century.
National security--Greece--21st century.
Terrorism--Greece--21st century.