M. Dorthy Beck, Joseph A. Bell, Ernest W. Shaw, Robert J. Huebner, Q Fever Studies in Southern California: II. An Epidemiological Study of 300 Cases, Public Health Reports (1896-1970), Vol. 64, No. 2 (Jan. 14, 1949), pp. 41-56
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Beck et al. (1949) studied this question.
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