Okla. Stat. tit. 2, § 15-7
The county commissioners when petitioned to do so by thirty percent (30%) of the resident taxpayers of their county shall call a special election of the resident taxpayers to whom they shall submit the question "Shall the county commissioners appropriate any sum of money, not to exceed one-half of one mill on the total assessed valuation of their counties for each current year, for premiums on agricultural and horticultural products and on purebred livestock and poultry?"
Laws 1910-11, SB 38, c. 118, p. 260, § 3.