Columbia subject headings:
Germans--Latvia--History--20th century.
Germans--Poland--History--20th century.
Latvia--Politics and government--1918-1940.
Legislators--Latvia--History--20th century.
Legislators--Poland--History--20th century.
Poland--Politics and government--1918-1945.
Political parties--Latvia--History--20th century.
Political parties--Poland--History--20th century.
Harvard subject headings:
Germans--Latvia--History--20th century.
Germans--Poland--History--20th century
Latvia--Politics and government--1918-1940.
Legislators--Latvia--History--20th century.
Legislators--Poland--History--20th century.
Poland--Politics and government--1918-1945
Political parties--Latvia--History--20th century.
Political parties--Poland--History--20th century
Princeton subject headings:
Germans--Latvia--History--20th century.
Germans--Poland--History--20th century.
Latvia--Politics and government--1918-1940.
Legislators--Latvia--History--20th century.
Legislators--Poland--History--20th century.
Poland--Politics and government--1918-1945.
Political parties--Latvia--History--20th century.
Political parties--Poland--History--20th century.