You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Language UND Remove constraint Language: UND Place Alpena Twp. T31N, R9E, Sec. 7 SW1/4; 1/4 mile west of power generators at the Four-Mile Dam. Remove constraint Place: Alpena Twp. T31N, R9E, Sec. 7 SW1/4; 1/4 mile west of power generators at the Four-Mile Dam. Place Michigan Remove constraint Place: Michigan Topic Prunella Remove constraint Topic: Prunella