; Western National Historic Trail (A) Establishment (i) Chisholm National Historic Trail The Chisholm National Historic Trail, a trail most heavily used by ranchers and drovers to move cattle to market between 1867 and 1884, extending along a route of approximately 1,378 miles from Kingsville, Texas, through Cuero and San Antonio, Texas, northward through Oklahoma to Abilene, Kansas, as generally depicted on the maps numbered 1 through 6 contained in the report prepared by the National Park Service entitled Chisholm and Great Western National Historic Trail Feasibility Study/Environmental Assessment and dated May 2019. (ii) Western National Historic Trail The Western National Historic Trail, a trail most heavily used by ranchers and drovers to move cattle to market between 1874 and 1897, extending along a route of approximately 1,350 miles from Kingsville, Texas, northward through Oklahoma and Dodge City, Kansas, to Ogallala, Nebraska, as generally depicted on the maps numbered 1 through 6 contained in the report prepared by the National Park Service entitled Chisholm and Great Western National Historic Trail Feasibility Study/Environmental Assessment and dated May 2019. (B) Availability of map The maps described in subparagraph (A) shall be on file and available for public inspection in the appropriate offices of the Department of the Interior. (C) Administration (i) In general The Secretary of the Interior shall administer the trails established by subparagraph (A) as a single administrative unit. (ii) Administration of portions of trail on non-Federal land (I) Requirements for administration The Secretary of the Interior shall administer any portion of a trail established by subparagraph (A) that is located on non-Federal land only— (aa) with the voluntary consent of the owner of the non-Federal land