Columbia subject headings:
Kurdistan--History--20th century.
Kurds--History--20th century.
Harvard subject headings:
Kurds--Iran--History--20th century.
Kurds--Iraq--History--20th century
Kurds--Turkey--History--20th century
Princeton subject headings:
Kurds--Iran--History--20th century.
Kurds--Iraq--History--20th century.
Kurds--Turkey--History--20th century.