63 STAT.] 81ST CONG., 1ST SESS.-CHS. 747, 751-OCT. 26, 1949 [CHAPTER 747] AN ACT To authorize the exchange of certain lands of the United States situated in Iosco County, Michigan, for lands within the national forests of Michigan, and for other purposes; Be it enacted by the Senate and Homuse of Representatives of the United States of America in Congress assembled, That, subject to approval by the National Forest Reservation Commission as estab- lished by section 4 of the Act of March 1, 1911 (36 Stat. 961), the Secretary of Agriculture is hereby authorized to exchange the follow- ing-described lands for lands of at least equal value situated within the exterior boundaries of national forests within the State of Michigan: Lots 2, 3, 4, 5, 6, and 7 of block 13, all of block 14, lots 1 to 10, inclusive, of block 15, lots 1 to 12, inclusive, of block 16, of Newmans Addition, East Tawas, Iosco County, Michigan: Provided, That any lands conveyed to the United States under the provisions of this Act shall be subject to all of the laws and rules and regulations applicable to lands acquired under the afore-mentioned Act of March 1, 1911, as amended: Provided,That if the mayor or other appropriate official of said town of East Tawas certifies in writing to the Secretary of Agriculture that any such lands authorized to be exchanged will be used for public purposes, the value of the lands to be accepted in exchange therefor by the Secretary of Agriculture shall be of a value at least equal to the sum of (1) the value of such lands used for non- public purposes, and (2) 50 per centum of the value of such lands used for public purposes: Provided further, That if, at any time during the fve-year period after such exchange, such lands originally used for public purposes cease to be so used, title thereto shall revert to the United States unless said town of East Tawas pays or transfers to the United States money, lands, or other valuable consideration equal to 50 per centum of the value (computed as of the date of such exchange) of such lands. Approved October 26, 1949. [CHAPTER 751] AN ACT 925 October 26, 1949 [H. R. 6601] [Public Law 403] East Tawas, Mich. Exchange of lands. 36 stat. 962. 16 U.S.0. . 613. 36 Stat. 961. 16 U. . o.0. 480, 613-S19, 621 , 552, 563, 500. Certificationinwrit- ing of use of land. Reversion to U. S . October 26, 1949 To amend the Federal Airport Act so as to authorize appropriations for projects [S. 2360 in the Virgin Islands. [ ublic Law 4041 Be it enacted by the Senate and House of Repre.entatives of the United States of America in Congress assembled, That section 5 (c) of the Federal Airport Act is amended to read as follows: "(c) For the purpose of carrying out this Act with respect to projects in the Territories of Alaska and Hawaii, and in Puerto Rico and the Virgin Islands, annual appropriations amounting in the aggregate to $20,000,000 are hereby authorized to be made to the Administrator over a period of seven fiscal years beginning with the fiscal year ending June 30, 1947. The appropriation for any such fiscal year shall remain available until June 30, 1953, unless sooner expended. Not to exceed 5 per centum of any such annual appro- priation, as specified in the Act making such appropriation, shall be available to the Administrator for necessary planning and research and for administrative expenses incident to the administration of this Act with respect to projects in the Territories of Alaska and Hawaii, and in Puerto Rico and the Virgin Islands; and the amount so available shall be deducted from such appropriation for purposes of determining the amount thereof available for grants for projects therein. Of the total amount available for such grants, 45 per centum Federal AirportAct, amendment. 60 Stat. 172. 49 U. S. C . §1104(c). Annual appropria- tion authorized. Planning and re- search.