in 1949.

In 1960, the National Office of Vital Statistics and the National Health Survey merged to form the National Center for Health Statistics. The National Health Survey had been created within PHS in 1956 through the National Health Survey Act ; it was the successor to a seminal national health survey performed by the Works Progress Administration during 1935-1936, which had multiple supplemental studies carried out in the intervening decades.

During the PHS reorganizations of 1966-1973,

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