43 U.S.C. § 900 : US Code - Section 900: Suits to cancel patents to lands erroneously issued under railroad or wagon-road grants

Search 43 U.S.C. § 900 : US Code - Section 900: Suits to cancel patents to lands erroneously issued under railroad or wagon-road grants

Suits by the United States to vacate and annul any patent to
lands erroneously issued under a railroad or wagon-road grant shall
only be brought within six years after the date of the issuance of
such patents. But no patent to any lands held by a bona fide
purchaser shall be vacated or annulled, but the right and title of
such purchaser is hereby confirmed: Provided, That no suit shall be
brought or maintained, nor shall recovery be had for lands or the
value thereof, that were certified or patented in lieu of other
lands covered by a grant which were lost or relinquished by the
grantee in consequence of the failure of the Government or its
officers to withdraw the same from sale or entry.