Ecology of chronic nonspecific respiratory diseases :  international symposium, September 7-8, 1971, Warsaw, Poland / 
editorial committee, Zbigniew Brzezinski, Jan Kopczynski, Feliks Sawicki. 
 - Warszawa :  Panstwowy Zaklad Wydawnictw Lekarskich,  1972. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Industrial Medicine -- congresses--Industrial Medicine -- congresses<br/>Respiratory Tract Diseases -- etiology -- congresses--Respiratory Tract Diseases -- etiology -- congresses--Respiratory Tract Diseases -- etiology -- congresses<br/>Respiratory Tract Diseases -- occurence -- congresses--Respiratory Tract Diseases -- occurence -- congresses--Respiratory Tract Diseases -- occurence -- congresses