You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Grassy area near headwaters of Red Creek, Dolly Sods Wilderness Area c. 11 mi WNW of Petersburg Remove constraint Place: Grassy area near headwaters of Red Creek, Dolly Sods Wilderness Area c. 11 mi WNW of Petersburg Topic Lichens Remove constraint Topic: Lichens