Mich. Comp. Laws § 397.371
Privately owned libraries; public support, limitation, conditions.
Any township, city or village within this state, having within its limits a library that had been open to the public upon the payment of dues, may appropriate not to exceed 1/2 of 1 mill on its assessed valuation for the support of such library, and such sum or sums shall be raised by taxation in the ordinary way: Prov…