16 U.S. Code § 21c -

The provisions of section 485 of this title shall continue to be applicable to the areas included within the Yellowstone National Park by section 21a of this title, and any lands within such areas acquired by exchange thereunder shall thereupon become a part of the Yellowstone National Park.

Source

(Mar. 1, 1929, ch. 437, § 3,45 Stat. 1436.)

 

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