You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Prairie Slough Conservation Area, ca 5 mi NE of Elsberry, off of Rt P, Hamburg 7.5' Quad. Remove constraint Place: Prairie Slough Conservation Area, ca 5 mi NE of Elsberry, off of Rt P, Hamburg 7.5' Quad.