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The 1950 edition of William's Obstetrics  provides the following comment:


Eastman HJ (1950) Williams Obstetrics, Tenth Edition, pp 397-398
William Harvey, 1653
Charles White, 1773
Erasmus Darwin, 1801
Textbooks, 1801-1986
Obstetric protocols
Recent reconsideration
Obstetrics 1950
Virginia Apgar, 1953
Apgar et al., 1958
Apgar et al., 1958 more
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