Statement relating to the eighteenth decennial census of the population. Message from the President of the United States transmitting a statement prepared by the Director of the Census, Department of Commerce, relating to the eighteenth decennial census of the population, pursuant to section 22(a) of the act of June 18, 1929, as amended (2 U.S.C. 2a). January 12, 1961. -- Referred to the Committee on the Judiciary and ordered to be printed with illustrations