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Place
- T29N R9E Sec 18, at Public Access site, 2 mi. SE of Ossineke.1
- T30N R8E Sec 34 2.2 mi NW of US-23 along Piper Rd.1
- T31N, R8E, SW1/4 of Sec. 23 City of Alpena; edge of parking lot on west side of Fochtman Motor Co. (between 2nd and 3rd Ave. on Lockwood St.)1
- Thunder Bay Island2
- Thunder Bay Island cleared area south of Lighthouse1
- Thunder Bay Island, on S. half of Island.1
- Thunder Bay Island.7
- Twin Sinks, Sink #2, near Leer7
- Twin Sinks, near Leer1
- Twin sinks #1 limestone sink1