42 U.S. Code § 7472. Initial classifications

(a) Areas designated as class IUpon the enactment of this part, all—

(1)

international parks,

(2)

national wilderness areas which exceed 5,000 acres in size,

(3)

national memorial parks which exceed 5,000 acres in size, and

(4)

national parks which exceed six thousand acres in size,

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