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B. J. Olson, C. L. Larson, An Epidemic of a Severe Pneumonitis in the Bayou Region of Louisiana: IV. A Preliminary Note on Etiology, Public Health Reports (1896-1970), Vol. 59, No. 42 (Oct. 20, 1944), pp. 1373-1374
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Olson et al. (1944) studied this question.
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