Columbia subject headings:
Harvard subject headings:
Ukraine--History--1917-1921--Sources.
Ukraine--History--Revolution, 1917-1921--Campaigns.
Ukraine--History--Revolution, 1917-1921--Sources.
World War, 1914-1918--Ukraine--Sources.
Princeton subject headings:
Ukraine--History--Revolution, 1917-1921--Campaigns.
Ukraine--History--Revolution, 1917-1921--Sources.
World War, 1914-1918--Ukraine--Sources.