You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Gypsum mesa on Beaver Creek, at Colo. Route 115, 2½ miles NE of PENROSE Remove constraint Place: Gypsum mesa on Beaver Creek, at Colo. Route 115, 2½ miles NE of PENROSE Topic Pottiales Remove constraint Topic: Pottiales Topic Pterygoneurum Remove constraint Topic: Pterygoneurum