The collections document the study of changes in human populations and their potential effects, especially of rising population and, to a lesser extent, policy work related to population issues. The collections include the papers of Alfred J. Lotka, a pioneer in the study of population dynamics who conducted research on the mathematical theory of evolution, Ansley J. Coale and Frank W. Notestein, who both directed Princeton University’s Office of Population Research, and the records of the Hugh Moore Fund, which promoted the study of world peace and world population.