Edgar Sydenstricker, A. W. Hedrich, Completeness of Reporting of Measles, Whooping Cough, and Chicken Pox at Different Ages: Hagerstown Morbidity Studies: Supplement to Study No. II, Public Health Reports (1896-1970), Vol. 44, No. 26 (Jun. 28, 1929), pp. 1537-1543
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