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 61 STAT.] SOTH CONG., 1ST SESS.-CIIS. 46-48-APR. 90, 1947 Canyon constructed under the authority of the Boulder Canyon Project Act, approved December 21, 1928 (45 Stat. 1057), and referred to as Hoover Dam in the Act approved February 14, 1931 (46 Stat. 1146) ; in the Act approved April 22, 1932 (47 Stat. 118); in the Act approved July 1, 1932 (47 Stat. 535); in the Act approved July 21, 1932 (47 Stat. 717); and in the Act approved February 17, 1933 (47 Stat. 845). Any law, regulation, document, or record of the United States in which such dam is designated or referred to under the name of Boulder Dam shall be held to refer to such dam under and by the name of Hoover Dam. Approved April 30, 1947. [CHAPTER 47] AN ACT To provide for annual and sick leave for rural letter carriers. Be it enacted by the Senate and House of Representatives of the United States of America in. Congress assembled, That section 6 of Public Law 134, Seventy-ninth Congress, chapter 274, first session, is hereby amended by adding the following paragraph to section 6 under the title "Annual Leave": "The authorized absence of a rural carrier on Saturdays which occur within or at the beginning or end of a period of sick or annual leave of five or more days' duration (or four days' duration if a holi- day falls within or at the beginning or end of the period of sick or annual leave) shall be without charge to such leave or loss of compen- sation: Provided,That Saturdays occurring in a period of annual or sick leave taken in a smaller number of days may at the option of the carrier be charged to his accrued leave and when so charged he shall be paid for such absence." SEC. 2. The amendment made by this Act shall take effect as of February 1, 1947. Approved April 30, 1947. [CHAPTER 48] AN ACT Authorizing the Commissioners of the District of Columbia to establish daylight saving time in the District of Columbia during 1947. Be it enacted by the Senate and House of 'epresentatives of the United States of America in Congress assembled, That, for the pur- pose of determining whether or not daylight saving time should be established in the District of Columbia during the year 1947, the Coim- missioners of the District shall conduct open hearings at which the residents of the District and those in neighboring counties who may be affected may express their views on the establishment of such time. SEC. 2. If, as a result of the hearings held pursuant to the first sec- tion of this Act, the Commissioners should decide that daylight saving time should be established in the District during the year 1947. the Commissioners are authorized to advance the standard time for the District one hour for any period of the year 1947 not earlier than the last Sunday of April of such vear and not later than the last Sunday of September of such vear. Any such time established by the Com- missioners pursuant to this Act shall, during the period for which it is applicable, be considered the standard time for the District of Columbia. 57 43U.S.0.§§617- 617t. April 30, 1947 [S. 5471 [Public Law 441 59 Stat. 436. 39U. S. C.§856. Absence of rural carriers on Saturdays. Effective date. April 30,1047 IS. 731i [Public l,aw 41- Daylight saving time, D. C. Hearings. Authority of Com- missioners.

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