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May, JR, R. Peto, C. Tinker, and C. Fletcher. A Study of Hemophilus Influenzae Precipitins in the Serum of Working Men in Relation to Smoking Habits, Bronchial Infection, and Airway Obstruction. 1973.

May, JR, et al. A Study of Hemophilus Influenzae Precipitins in the Serum of Working Men in Relation to Smoking Habits, Bronchial Infection, and Airway Obstruction. 1973.