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Reynoldson B. Zehmer, Paul B. Dean, W. Daniel Sudia, Charles H. Calisher, Gladys E. Sather, Richard L. Parker, Venezuelan Equine Encephalitis Epidemic in Texas, 1971, Health Services Reports, Vol. 89, No. 3 (May - Jun., 1974), pp. 278-282
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Zehmer et al. (1974) studied this question.
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