41 USC 10a - American materials required for public use

(a) In general 
Notwithstanding any other provision of law, and unless the head of the department or independent establishment concerned shall determine it to be inconsistent with the public interest, or the cost to be unreasonable, only such unmanufactured articles, materials, and supplies as have been mined or produced in the United States, and only such manufactured articles, materials, and supplies as have been manufactured in the United States substantially all from articles, materials, or supplies mined, produced, or manufactured, as the case may be, in the United States, shall be acquired for public use. This section shall not apply with respect to articles, materials, or supplies for use outside the United States, or if articles, materials, or supplies of the class or kind to be used or the articles, materials, or supplies from which they are manufactured are not mined, produced, or manufactured, as the case may be, in the United States in sufficient and reasonably available commercial quantities and of a satisfactory quality. This section shall not apply to manufactured articles, materials, or supplies procured under any contract the award value of which is less than or equal to the micro-purchase threshold under section 428 of this title.
(b) Reports 

(1) In general 
Not later than 180 days after the end of each of fiscal years 2007 through 2011, the head of each Federal agency shall submit to the Committee on Homeland Security and Governmental Affairs of the Senate and the Committee on Oversight and Government Reform of the House of Representatives a report on the amount of the acquisitions made by the agency in that fiscal year of articles, materials, or supplies purchased from entities that manufacture the articles, materials, or supplies outside of the United States.
(2) Contents of report 
The report required by paragraph (1) shall separately include, for the fiscal year covered by such report

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(A) the dollar value of any articles, materials, or supplies that were manufactured outside the United States;
(B) an itemized list of all waivers granted with respect to such articles, materials, or supplies under this Act, and a citation to the treaty, international agreement, or other law under which each waiver was granted;
(C) if any articles, materials, or supplies were acquired from entities that manufacture articles, materials, or supplies outside the United States, the specific exception under this section that was used to purchase such articles, materials, or supplies; and
(D) a summary of
(i) the total procurement funds expended on articles, materials, and supplies manufactured inside the United States; and
(ii) the total procurement funds expended on articles, materials, and supplies manufactured outside the United States.
(3) Public availability 
The head of each Federal agency submitting a report under paragraph (1) shall make the report publicly available to the maximum extent practicable.
(4) Exception for intelligence community 
This subsection shall not apply to acquisitions made by an agency, or component thereof, that is an element of the intelligence community as specified in, or designated under, section 401a (4) of title 50.