Pneumonitis. Epidemic of severe pneumonitis in bayou region of Louisiana: 1, Epidemiological study [with list of references], by B. J. Olson and W. L. Treuting; 2, Clinical features of the disease [with list of references], by W. L. Treuting and B. J. Olson; 3, Pathological observations, report of autopsy on 2 cases with brief comparative note on psittacosis and Q fever [and with list of references], by Chapman H. Binford and George H. Hauser; 4, Preliminary note on etiology, by B. J. Olson and C. L. Larson.

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