Columbia subject headings:
Cities and towns--Europe, Eastern--History--20th century.
Sound in motion pictures.
Sound--Social aspects--Europe, Central--History--20th century.
Sound--Social aspects--Europe, Eastern--History--20th century.
World War, 1939-1945--Europe, Central.
World War, 1939-1945--Europe, Eastern.
World War, 1939-1945--Radio broadcasting and the war.
Harvard subject headings:
Cities and towns--Europe, Eastern--History--20th century.
Sound in motion pictures.
Sound--Social aspects--Europe, Central--History--20th century.
Sound--Social aspects--Europe, Eastern--History--20th century.
World War, 1939-1945--Europe, Central.
World War, 1939-1945--Europe, Eastern.
World War, 1939-1945--Radio broadcasting and the war.
Princeton subject headings:
Cities and towns--Europe, Eastern--History--20th century.
Sound in motion pictures.
Sound--Social aspects--Europe, Central--History--20th century.
Sound--Social aspects--Europe, Eastern--History--20th century.
World War, 1939-1945--Europe, Central.
World War, 1939-1945--Europe, Eastern.
World War, 1939-1945--Radio broadcasting and the war.