Withdrawals of large tracts of land (over 5,000 acres) can be made only for 20-year periods, subject to a legislative veto by concurrent resolution of both houses. (The constitutionality of this legislative veto provision is dubious.)

• 收回大片土地（超过5000英亩）只能持续20年，而且可以被国会两院共同做出的决议所否决，这一否决条款的合宪性是值得怀疑的。