You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place behind low dunes 600 ft. N. of mouth of the Au Sable Riv. on L. Huron on S. side of town of Oscoda. Au Sable Twp. T23N, R9E, Sec.3, SE1/4 Remove constraint Place: behind low dunes 600 ft. N. of mouth of the Au Sable Riv. on L. Huron on S. side of town of Oscoda. Au Sable Twp. T23N, R9E, Sec.3, SE1/4