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A. Rumreich, R. E. Dyer, L. F. Badger, The Typhus-Rocky Mountain Spotted Fever Group: An Epidemiological and Clinical Study in the Eastern and Southeastern States, Public Health Reports (1896-1970), Vol. 46, No. 9 (Feb. 27, 1931), pp. 470-480
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Rumreich et al. (1931) studied this question.
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