It shall be the duty of the county board of each county receiving such money to use the portion allotted to public schools to aid in maintaining those school districts that may be situated within or near the national forest, and the portion allotted for public roads shall be used, as far as practicable, in the construction and repair of roads within or near the national forests. This section shall not apply to any such sums of money which may have been allotted or set aside for the purpose of paying loans which may have been made by any county pursuant to the provisions of sections 94.52 and 94.53.