You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Between Sharpsburg & Keedysville along MD Rt 34, Shepherdstown Pike, at Porterstown Bridge over Anteietam Creek. Remove constraint Place: Between Sharpsburg & Keedysville along MD Rt 34, Shepherdstown Pike, at Porterstown Bridge over Anteietam Creek. Place Maryland Remove constraint Place: Maryland Place North America Remove constraint Place: North America Place Washington Remove constraint Place: Washington Topic Carex Remove constraint Topic: Carex Topic Cyperaceae Remove constraint Topic: Cyperaceae Topic Plantae Remove constraint Topic: Plantae Topic Poales Remove constraint Topic: Poales