in subsection (a), the Secretary of the Treasury (referred to in this Act as the Secretary ) shall strike a gold medal with suitable emblems, devices, and inscriptions, to be determined by the Secretary. (c) Lincoln County Historical Museum Following the presentation described in subsection (a), the gold medal shall be given to the Lincoln County Historical Museum in North Platte, Nebraska, where the medal shall be available for display as appropriate and made available for research. 4. Duplicate medals The Secretary may strike and sell duplicates in bronze of the gold medal struck under section 3, at a price sufficient to cover the costs of the medals, including labor, materials, dies, use of machinery, and overhead expenses. 5. Status of medals (a) National medals Medals struck under this Act are national medals for purposes of chapter 51 of title 31, United States Code. (b) Numismatic items For purposes of sections 5134 and 5136 of title 31, United States Code, all medals struck under this Act shall be considered to be numismatic items. 6. Authority to use fund amounts