1. On the relative influence of city and country life, on morality, health, fecundity, longevity and mortality Author(s): Hough, John Stockton, 1845-1900, author Publication: [Philadelphia?] : [publisher not identified], [1874?] Subject(s): Urban PopulationRural PopulationFertilityMortalityLongevityUnited States
2. Fecundity, fertility, sterility, and allied topics Author(s): Duncan, J. Matthews (James Matthews), 1826-1890 Publication: New York : Wood, 1871 Subject(s): FertilityInfertilityFamily Characteristics