(1932). Problems of population: Being the report of the proceedings of the second general assembly of the International Union for the Scientific Investigation of Population problems held at Royal Society of Arts, London, June 15-18, 1931. Kennikat Press.

Problems of Population: Being the Report of the Proceedings of the Second General Assembly of the International Union for the Scientific Investigation of Population Problems Held at Royal Society of Arts, London, June 15-18, 1931. Port Washington: Kennikat Press, 1932.

Problems of Population: Being the Report of the Proceedings of the Second General Assembly of the International Union for the Scientific Investigation of Population Problems Held at Royal Society of Arts, London, June 15-18, 1931. Kennikat Press, 1932.