The Secretary of the Interior may authorize the purchase of such law books, books of reference, periodicals, engineering and statistical publications as are needed in carrying out the surveys and examinations authorized by the Act of June seventeenth, nineteen hundred and two, entitled "An Act appropriating the receipts from the sale and disposal of public lands in certain States and Territories for the construction of irrigation works for the reclamation of arid lands."
(May 27, 1908, ch. 200,
Act of June seventeenth, nineteen hundred and two, referred to in text, is act June 17, 1902, ch. 1093,