Supplemental estimate, District of Columbia, National Zoological Park and Public Employment Service. Communication from the President of the United States transmitting supplemental estimate of appropriations for the District of Columbia, for the National Zoological Park, for the fiscal year 1931, to remain available until June 30, 1932, $4,500; for the Public Employment Service, for the fiscal year 1932, $4,500; amounting in all to $9,000.