Columbia subject headings:
Katowice (Poland : Voivodeship)--Economic conditions.
Kraków (Poland)--Economic conditions.
Opole (Poland : Voivodeship)--Economic conditions.
Województwo Małopolskie (Poland)--Economic conditions.
Harvard subject headings:
Katowice (Poland : Voivodeship)--Economic conditions.
Kraków (Poland : Voivodeship)--Economic conditions.
Kraków (Poland)--Economic conditions.
Opole (Poland : Voivodeship)--Economic conditions.
Województwo Małopolskie (Poland)--Economic conditions.
Princeton subject headings: