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Show 362 early and important role, are within areas under the jurisdic- tion of the National Park Service.69 And in the exercise of his authority to make rules and regulations for the use and man- agement of such areas, the Secretary of the Interior has made provision for, among other things, forest-fire prevention, ero- sion control, and water-pollution control.60 Indian Lands Under the direction of the Secretary of the Interior, and subject to such regulation as the President may prescribe, the Commissioner of Indian Affairs manages Indian affairs and matters arising out of Indian relations.61 Indian lands are not public lands.62 They are lands held for varying periods of time by the United States in trust for the Indians, or by the Indians under restricted deeds or patents, and are man- aged or supervised by the United States.63 In addition to irrigation undertakings on Indian lands, al- ready discussed, the supervisory activities of the Bureau of Indian Affairs afford guidance and help to Indians respecting use of lands, including forest and range management, sustained- yield practices, and prevention of erosion.64 Tennessee Valley Authority The Tennessee Valley Authority Act of 1933 furnishes a unique example of congressional recognition of the interrela- 59 See, e. g., Origin of the Scenic Features of the Glacier National Park, Department of the Interior, National Park Service, pp. 20-21 and map following p. 22 (1921). 60 Act of August 25, 1916, § 3, 39 Stat. 535, as amended, 16 U. S. C. 3; 36 C. F. R. 1.0-27.7. 61R. S. § 463, from Act of July 9,1832, § 1, 4 Stat. 564, and Act of July 27, 1868, § 1,15 Stat. 228, 25 U. S. C. 2; R. S. § 465, from Act of June 30, 1834, § 17, 4 Stat. 735, 738, 25 U. S. C. 9. 91 Ash Sheep Co. v. United States, 252 U. S. 159, 166 (1920). w Act of February 8, 1887, § 5, 24 Stat. 388, 389, as amended, 25 U. S. C. 348; Sunderland v. United States, 266 U. S. 226, 233-235 (1924). See also Hitchcock v. United States, 205 U. S. 80 (1907). 84 See supra, pp. 246-254; 25 C. F. R. 61.1-61.30. |