- Alpena Twp., this material collected in garden at 409 Dawson on N. side of Alpena1
- Alpena Twp., within 1/2 mile of Lake Huron, on east side of North Point Road1
- Alpena Twp., ¼ mile west of Lake Huron. 30 feet west of North Point Road.1
- Alpena Twp.T31N,R9E,Sec.10,SW1/4 on E. side of N. Point Rd. near double culvert crossing 1/4 mi. N. of Indian Rd. E. of Alpena near E1 Cajon Bay.1
- Alpena limestone sinks.1
- Alpena twp. T31N, R8E, Sec. 15, SE 1/41
- Alpena.1
- At S. end of Long Lake.1
- At the Natural Resources Center at Alpena Community College. Alpena Twp.1
- Bolton sink.1
- Brusseau Rd, off1
- City of Alpena, On Thunder Bay River Duck Park canoe launch.1
- E. side of Heron Rd. 1.2 mi. south of Long Rapids Rd. ca. 10 mi. N.W. of Alpena. Maple Ridge Twp. T31N, R7E, Sec.6 SW1/41
- E. side of Woodward Rd. ca. 500 ft. S. corner of Hamilton Rd. and Woodward Alpena Twp. T31N, R8E, Sec. 10 NW1/41
- East side of US-23, 2.7 mi. south of Michigan State Police post in Alpena (near base of Partridge Pt. peninsula)1
- Found on the east side of Cathro Road, 1 1/4 mile north of the intersection of Cathro and Long Rapids Road. Maple Ridge Twp.1
- Green Twp. T31N, R5E, Sec. 3, N.E.1/4 on the south side of Long Rapids Road about I mile west of Hodgins Rd.1
- Herron Rd, Blue Lake, S1
- In power line clearing 150 ft. E. of Four Mile Dam Rd. and 300 S. of Long Rapids Rd. about 4 mi. N.W. of Alpena. Alpena Twp.1
- J.K. Bain Property1