1996—Puspan. L. 104–106 substituted “not later than June 30, 1998” for “not later than five years after the date it is included within this chapter”.

1962—Puspan. L. 87–719 inserted “in the case of Oak Ridge and Richland, or, in the case of Los Alamos, not later than five years after the date it is included within this chapter” after “August 4, 1955,”.