Nothing herein contained shall affect any valid claim, location, or entry existing under the land laws of the United States, prior to February 26, 1919, whether for homestead, mineral, right-of-way, or any other purpose whatsoever, or shall affect the rights of any such claimant, locator, or entryman to the full use and enjoyment of his land and nothing herein contained shall affect, diminish, or impair the right and authority of the county of Coconino, in the State of Arizona, to levy and collect tolls for the passage of livestock over and upon the Bright Angel Toll Road and Trail, and the Secretary of the Interior is authorized to negotiate with the said county of Coconino for the purchase of said Bright Angel Toll Road and Trail and all rights therein.