Death rates from all causes by weeks in certain large cities of the United States during the winter of 1918–19. (Pearl.)
CHART V.
Death rates from all causes by weeks in certain large cities of the United States during the winter of 1918–19. (Pearl.)
CHART VI.
Death rates from all causes by weeks in certain large cities of the United States during the winter of 1918–19. (Pearl.)
CHART VII.
