doi:10.7916/D8Q245RPMortality statistics of the seventh census of the United States, 1850: Embracing -- I. -- the cause of death, II. -- the age and sex, III. -- the color and condition, IV. -- the nativity, V. -- the season of decease, VI. -- the duration of illness, VII. -- the occupation, of the persons reported to have died in the twelve months preceding the first of June of that year, with sundry comparative and illustrative tablesUnited States. Bureau of the Censusbookstext