Map showing, in five degrees of density, the birth rate prevailing in the territory of the United States east of the 100th Meridian, so far as the same is indicated by the ratio between the total population and the number of children under one year of age surviving at the date of enumeration, June 1st. Compiled from the returns of population at the ninth census of the United States, 1870. By Francis A. Walker. (Julius Bien, Lith., 1874)
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Map showing, in five degrees of density, the birth rate prevailing in the territory of the United States east of the 100th Meridian, so far as the same is indicated by the ratio between the total population and the number of children under one year of age surviving at the date of enumeration, June 1st. Compiled from the returns of population at the ninth census of the United States, 1870. By Francis A. Walker. (Julius Bien, Lith., 1874)
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