The underutilization of vital statistics.
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Public Health↗
Biomedical subjects
C L Erhardt
Publications and source records attributed to C L Erhardt.
A study of risks, medical care, and infant mortality. 2. Ethnic group, education of mother, and birth weight.
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Black or African American↗
Seasonal patterns of conception in New York City.
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Black or African American↗
An epidemiological approach to infant mortality.
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Adult↗
Air pollution, influenza, and mortality in New York City; January-February 1963.
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Air Pollution↗
Asthma and temperature change. II. 1964 and 1965 epidemiological studies of emergency clinic visits for asthma in three large New York City hospitals.
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Air Pollution↗
Highlights of the first 100 years.
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History, 19th Century↗