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Ecology of chronic nonspecific respiratory diseases : international symposium, September 7-8, 1971, Warsaw, Poland / Editorial committee: Zbigniew Brzeziński, Jan Kopczyńsski, Feliks Sawicki.
- 573.239 E1939
- Symposium on Ecology of Chronic Nonspecific Respiratory Diseases (1971 : Warsaw),
- Państwowy Zakład Wydawn. Lekarskich,
- Warszawa :