1. Physical degeneracy Author(s): Allen, Nathan, 1813-1889, author Publication: New York : D. Appleton and Company, 1870 Subject(s): Physical FitnessTemperamentPopulation DynamicsNew England
2. The law of human increase, or, Population based on physiology and psychology Author(s): Allen, Nathan, 1813-1889, author Publication: New York : Moorhead, Simpson & Bond, 1868 Subject(s): Population DynamicsNew England
