Minn. Stat. § 134.18

Any public library board in any city of the first class in this state, whether such board was created by and under the general laws or by special act of the legislature, may enter into arrangement with the authorities of the county within which it is located, or with the authorities of any adjoining county, or with the authorities of any statutory city within any such county, whereby the inhabitants of any such county or statutory city may secure the privileges of using the library and museums of any such library board and the authorities of any such county or statutory city are hereby authorized to defray the expenses any such arrangement may involve.