SDCL § 14-2-37: Joint public library--Board of trustees--Proportional appointment.

If one or more governing bodies join under the provision of chapter 1-24 to create a joint public library, the joint public library shall be governed by a board of public library trustees appointed respectively by each participating governing body in a number proportional to the funds provided by that governing body to the total of the joint public library's funds for the provision of public library services, for the purchase of public library materials, and for the provision and maintenance of public library quarters.