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Joseph W. Mountin, Elliott H. Pennell, Georgie S. Brockett, Location and Movement of Physicians, 1923 and 1938: Changes in Urban and Rural Totals for Established Physicians, Public Health Reports (1896-1970), Vol. 60, No. 7 (Feb. 16, 1945), pp. 173-185
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Mountin et al. (1945) studied this question.
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