You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place boulders used to construct an old mill dam on the Christina River near I-95 and 0.25 mile north crossing by Old Baltimore Pike Remove constraint Place: boulders used to construct an old mill dam on the Christina River near I-95 and 0.25 mile north crossing by Old Baltimore Pike Topic Grimmiaceae Remove constraint Topic: Grimmiaceae