Columbia subject headings:
Caucasus--History, Military--20th century--Chronology.
Caucasus--Politics and government--20th century--Chronology.
Iran--Foreign relations--Caucasus.
Russia--Foreign relations--Caucasus.
Turkey--Foreign relations--Caucasus.
Harvard subject headings:
Caucasus--History, Military--20th century--Chronology.
Caucasus--Politics and government--20th century--Chronology.
Iran--Foreign relations--Caucasus.
Russia--Foreign relations--Caucasus.
Turkey--Foreign relations--Caucasus.
Princeton subject headings:
Caucasus--History, Military--20th century--Chronology.
Caucasus--Politics and government--20th century--Chronology.
Iran--Foreign relations--Caucasus.
Russia--Foreign relations--Caucasus.
Turkey--Foreign relations--Caucasus.