Columbia subject headings:
Latvia--History--1914-1918--Sources.
Latyshskie strelki (Russia and R.S.F.S.R.)
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Latvia--History--1914-1918--Sources.
Latyshskie strelki (Russia and R.S.F.S.R.)
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings: