- on E. side of M-18 ca. 6 Mi. south of Roscommon. Higgins Twp. T23N, R2W, Sec. 7 NW1/42
- At Lane's Lake, ca. 7.5 mi. SE of Prudenville.1
- Au Sable Twp., ca. 8 mi. N. of St. Helen.1
- Backus Lake.1
- Behind Marl Lake between Higgins & Houghton.1
- By Sugar Creek, ca. 11 mi. SE of Prudenville.1
- Ca. 5 mi. SE of Roscommon1
- Houghton1
- Houghton Heights.1
- Houghton Lake Wildlife Research Area (Porter Ranch) ca. 6 km. sw of Houghton Lake T22N, R4W.1
- Houghton Lake Wildlife Research Area (Porter Ranch) ca. 6 km. SW of Houghton Lake. Near P-60 and P-61 on study site.1
- Houghton Lake Wildlife Research Area (Porter Ranch) ca. 6 km. sw of Hough- ton Lake.1
- Houghton Lake Wildlife Research Area (Porter Ranch) ca. 6 km. sw of Houghton Lake. T22N, R4W.1
- Houghton Lake Wildlife Research Area (Porter Ranch), ca. 6 km. SW of Houghton Lake.1
- Houghton Lake Wildlife Research Area (Porter ranch), ca. 6 km SW of Houghton Lake1
- Houghton Lake, Prudenville1
- Houghton.1
- Hudson Creek Swamp, ca. 5 mi. SE of Roscommon1
- Keno Swamp, bog between St. Helena and Roscommon along old road.1
- Lake Twp., Houghton Lake State Forest. Along M-27; SW 1/4 Sec. 34, T21N, R4W.1