Columbia subject headings:
Lithuania--Foreign relations--Poland.
Monuments--Poland--Sejny.
Poland--Foreign relations--Lithuania.
Poland--History--1918-1945.
Sejny (Poland)--History--Wars.
Harvard subject headings:
Lithuania--Boundaries--Poland.
Poland--Boundaries--Lithuania.
Russo-Polish War, 1919-1920.
Sejny Region (Poland)--History, Military--20th century.
Suwałki Region (Poland)--History, Military--20th century.
Princeton subject headings: