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, along rail tracks ca 5 km SW of Dutton (Dutton Swamp). Remove constraint Place: Dunwich Township, along rail tracks ca 5 km SW of Dutton (Dutton Swamp).