1976—Subsecs. (a) to (d). Pub. L. 94–455 struck out “or his delegate” after “Secretary” wherever appearing.

1966—Subsec. (a). Pub. L. 89–719 inserted reference to real estate which has been redeemed by the United States.

Amendment by Pub. L. 89–719 applicable after Nov. 2, 1966, regardless of when title or lien of United States arose or when lien or interest of another person was acquired, with certain exceptions, see section 114(a)–(c) of Pub. L. 89–719, set out as a note under section 6323 of this title.