53 STAT.] 76TH CONG., IST SESS.-CHS. 717, 718-AUG. 11 , 1939 SE. 2 . Any moneys expended on such construction from appro- priations made under the authority of this Act shall be repaid to the United States by the water users in not to exceed forty annual installments. Any labor or materials supplied for such construction by the Work Projects Administration, the Civilian Conservation Corps, or any other Federal agency shall be utilized in such manner as the President may determine, and for such labor and materials the water users shall reimburse the United States in such amounts and on such terms as the President may fix for each project. SEC. 3. No moneys may be expended on a project pursuant to the authority of this Act unless and until (1) the Secretary of the Interior has found, and has certified to the President, that the project has engineering feasibility and that the moneys to be expeneded on the project from appropriations made under the authority of this Act probably can be repaid by the water users within forty years; and (2) the President has approved said findings and has determined that labor and materials for the construction of the project should be made available to the Department of the Interior by the Work Projects Administration or a similar Federal agency, in the amount found by the Secretary of the Interior to make up the difference, if any, between the estimated cost of construction and the amount which can be expended from appropriations made under this Act and probably can be repaid by the water users: Provided, That the Secretary of the Interior may accept for the construction of the project such labor or materials as may be offered by any State or political subdivision thereof, State agency, or municipal corporation, and may reduce by the amount thereof the estimated cost of construc- tion to be met by the expenditure of Federal moneys. SEC. 4. There is hereby authorized to be appropriated, out of any money in the Treasury not otherwise appropriated, such sums of money as may be necessary to carry out the provisions of this Act, including investigations and surveys of projects proposed under the authority of this Act; and, from such sums appropriated or trans- ferred, expenditures may be made for personal services in the District of Columbia and may be made for the same purposes and under the same conditions as included in the appropriation Acts for the depart- ments, establishments, and other agencies to which sums may be made available by appropriation or transfer. Approved, August 11, 1939. [CHAPTER 718] AN ACT To amend an Act entitled "An Act to regulate the practice of the healing art to protect the public health in the District of Columbia", known as the "Healing Arts Practice Act, District of Columbia, 1928", approved February 27, 1929. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the Act of Congress entitled "An Act to regulate the practice of the healing art to protect the public health in the District of Columbia", known as the "Healing Arts Practice Act, District of Columbia, 1928", approved February 27, 1929, be amended by striking from the first sentence of section 18 thereof the words "beginning on the second Monday in January and July of each year and at such other" and inserting in lieu thereof the words "at such". Approved, August 11, 1939. 1419 9890'---39--PT 2 -58 Reimbursement of expenditures by water users. Labor and mate- rials. Provisions requi- site. Engineering feasi- bility. Repayment of ex- penditures. Executive approval. Proviso. Local cooperation. Appropriation au- thorized. Personal services. August 11, 1939 [S. 27791 [Public, No. 3991 Healing Arts Prac- tice Act, D. C., 1928, amendment. 45 Stat. 1331. Dates for holding professional examina tions.