The board is hereby authorized, empowered and directed, in its discretion, to offer for advertising purposes, the protective covers of the several free textbooks, to accept bids, and to let contracts for said space. The contracts for said advertising purposes shall be let for definite periods not to exceed two (2) years.
It shall be the duty of the board, if it is desired that advertising shall be used, to approve all proposed advertising submitted for use on the covers of such free textbooks, and to accept only that advertising which will be in keeping with the spirit of the schools in promoting the children physically, mentally and morally. The board is hereby authorized, empowered and directed, in its discretion, to reject any and all bids submitted. No sectarian, un-American or immoral advertisements shall be accepted.
All moneys derived from sale of such advertising shall be deposited in the State Treasury for the benefit of the General Fund.