Heppleston, A G Quartz but not iron oxide causes airflow obstruction, emphysema, and small airways lesions in the rat. [electronic resource] - The American review of respiratory disease Jun 1989 - 1570 p. digital Publication Type: Letter ISSN: 0003-0805 Standard No.: 10.1164/ajrccm/139.6.1570 doi Subjects--Topical Terms: AnimalsBronchi--pathologyDust--adverse effectsFerric CompoundsPulmonary Emphysema--etiologyQuartzRatsSilicon Dioxide