Columbia subject headings:
Bŭlgarska komunisticheska partii︠a︡--Party work.
Communist International--History.
Communist parties--Balkan Peninsula--History--20th century--Sources.
Communist parties--Balkan Peninsula--History--20th century.
Kommounistikon Komma tēs Hellados--History--20th century--Sources.
Kommounistikon Komma tēs Hellados--History.
Political parties--Greece--History--20th century.
Harvard subject headings:
Bŭlgarska komunisticheska partii︠a︡--Archives.
Communist parties--Bulgaria--History--Sources.
Communist parties--Greece--History--Sources.
Kommounistikon Komma tēs Hellados--History--20th century--Sources.
Political parties--Greece--History--20th century--Sources.
Princeton subject headings:
Bulgarska Komunisticheska partii--Archival resources.
Kommounistiko Komma Helladas--History--20th century--Sources.
Political parties--Greece--History--20th century--Sources.