May 1921 Issue [Article] Forecasting the growth of nations Download PDF Adjust Share The future population of the world and its problems by Raymond Pearl, Fred C. (Fred Charters) Kelly, This article is only available as a PDF to subscribers. Download PDF Tags 20th century Birth control Europe Influence Moral and ethical aspects Population Population forecasting Statistics United States World War I, 1914-1918 More from Raymond Pearl Patterns for living together Biology and human progress Adjust Share