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2. Occupational dermatitis causing days away from work in U.S. private industry, 1993
3. Central Statistical Office. 1991. Statistical yearbook 1991. Warsaw: Zaklad Wydawnictw Statystycznych. 596 p (in Polish).
4. Central Statistical Office. 2000. Statistical yearbook of the Republic of Poland 2000. Warsaw: Zaklad Wydawnictw Statystycznych. 722 p.