ANGULAR AND FIBROUS PARTICLES IN LUNG IN RELATION TO JOB CATEGORY

A. Dufresne,* R. Begin,t C. Dion,* J. Jagirdar,§ W. N. Rom,§ P. Loosereewanich,* D. C. F. Muir,1f A. C. Ritchie^ and G. Perraultt *McGill University, Department of Occupational Health, Faculty of Medicine, 3450 University Street, suite 22, Montreal (Quebec), Canada, H3A 2A7; fService de pneumologie, Centre Hospitalier de l'Universite de Sherbrooke, Sherbrooke (Quebec), Canada J1H 5N4; $Institut de recherche en sant6 et s6curit6 du travail, Direction des laboratoires, 505 Ouest, de Maisonneuve, Montreal (Qu6bec), Canada H3A 3C3; §Bellevue NYU Medical Centre, 27th Street-lst Avenue, New York, NY 10016, U.S.A.; and f McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5