Columbia subject headings:
Baltic Provinces (Russia)
Baltic Provinces (Russia)--Economic conditions.
Poland--Economic conditions--1918-
Poland.
Harvard subject headings:
Baltic Provinces (Russia)
Baltic Provinces (Russia)--Economic conditions.
Poland
Poland--Economic conditions--1918-
Princeton subject headings:
Baltic Provinces (Russia)
Baltic Provinces (Russia)--Economic conditions.
Poland--Economic conditions--1918-
Poland.