Columbia subject headings:
Industrial concentration--Poland--Statistics.
Industrial productivity--Poland--Statistics.
Poland--Economic conditions--1981-1990--Statistics.
Poland--Economic conditions--1990---Statistics.
Harvard subject headings:
Industrial concentration--Poland--Statistics.
Industrial productivity--Poland--Statistics.
Industrial statistics--Poland.
Poland--Economic conditions--1981-1990--Statistics.
Poland--Economic conditions--1990---Statistics.
Princeton subject headings: