Mich. Comp. Laws § 397.564

Sec. 14. A cooperative board shall provide, directly or through a written contract, services to member libraries within the cooperative library's area. The services, subject to standards approved by the department in consultation with the state librarian, may include: (a) A central pool or rotating book collection. (b) In-service training. (c) Book selection aids. (d) Bibliographic services. (e) Audio-visual services. (f) Bookmobile service or other outlets to outlying areas. (g) Publicity and public relations. (h) Printing. (i) A centralized purchasing operation. (j) Centralized processing, including cataloging and marking. (k) Reference services. (l) Delivery service.