You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Aetna Twp. Sec. 19 NW 1/4, T13N, R10W Rosy Run Creek at 2-track crossing about 3/4 mile west of 230th Ave. Remove constraint Place: Aetna Twp. Sec. 19 NW 1/4, T13N, R10W Rosy Run Creek at 2-track crossing about 3/4 mile west of 230th Ave.