Columbia subject headings:
Russian drama--Appreciation--Latvia--Rīga.
Theater--Latvia--Rīga--History--20th century.
Harvard subject headings:
Russian drama--Appreciation--Latvia--Rīga.
Theater--Latvia--Rīga--History--20th century.
Princeton subject headings:
Russian drama--Appreciation--Latvia--Rīga.
Theater--Latvia--Rīga--History--20th century.