Mich. Comp. Laws § 399.61

Sec. 1. The Michigan historical commission be and it is hereby designated as the agency of the state of Michigan to receive and safely keep the field notes, maps, plats, records, and all other papers appertaining to land titles in the public survey office of the United States, relating to the state of Michigan, that may not be needed by the United States; and that any and all authorities of the United States be and they are hereby allowed to have free access to the same at any time, as provided by the act of congress, approved May 28, 1926, entitled "An act to provide for the transfer of certain records of the general land office to states and for other purposes."