You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Clackamas Remove constraint Place: Clackamas Place Mt. Hood National Forest, 1.2 km NE of Twin Springs Campground, just NE of Plaza and Squaw Mountain trailheads, 19.3 km WSW of Government Camp Remove constraint Place: Mt. Hood National Forest, 1.2 km NE of Twin Springs Campground, just NE of Plaza and Squaw Mountain trailheads, 19.3 km WSW of Government Camp Place North America Remove constraint Place: North America Place Oregon Remove constraint Place: Oregon Place USA Remove constraint Place: USA