As soon as practicable after October 2, 1968, the Secretary of Agriculture shall file a map and legal description of the Pasayten Wilderness and of the Glacier Peak Wilderness, as hereby modified, with the Committee on Energy and Natural Resources of the Senate and the Committee on Natural Resources of the House of Representatives, and such descriptions shall have the same force and effect as if included in this subchapter: Provided, however, That correction of clerical or typographical errors in such legal descriptions and maps may be made.

Upon the filing of the legal descriptions and maps as provided for in subsection (a) of this section the Pasayten Wilderness and the additions to the Glacier Peak Wilderness shall be administered by the Secretary of Agriculture in accordance with the provisions of the Wilderness Act [16 U.S.C. 1131 et seq.] and thereafter shall be subject to the provisions of the Wilderness Act governing areas designated by that Act as wilderness areas, except that any reference in such provisions to the effective date of the Wilderness Act shall be deemed to be a reference to the effective date of this subchapter.