25 U.S.C. § 97

Proposals or bids for contracts to be preserved

In all lettings of contracts in connection with the Indian Service, the proposals or bids received shall be filed and preserved..

( Aug. 15, 1876, ch. 289, § 3 , 19 Stat. 199 ; June 21, 1906, ch. 3504 , 34 Stat. 328 ; Pub. L. 104–316, title I, § 112(b) , Oct. 19, 1996 , 110 Stat. 3833 .)