You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Dunwich Township & Dutton Swamp, 10.3 km SW of Dutton Post Office. Remove constraint Place: Dunwich Township & Dutton Swamp, 10.3 km SW of Dutton Post Office.