You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place W 1/2 Sec. 24 T39N-R30W ca. 1 1/2 mi. ESE of Niagara, WI Remove constraint Place: W 1/2 Sec. 24 T39N-R30W ca. 1 1/2 mi. ESE of Niagara, WI Topic Erigeron Remove constraint Topic: Erigeron