CHRONIC RESPIRATORY DISEASE. OUTDOOR WORKERS IN THE UNITED STATES AND EUROPE.
D002140:California; D004813:Epidemiology; D005060:Europe; D006306:Health Surveys; D006801:Humans; D012120:Respiration Disorders; D012140:Respiratory Tract Diseases; D014481:United States
CALIFORNIA; EPIDEMIOLOGY; HEALTH SURVEYS; RESPIRATORY TRACT DISEASES