- N. side of Down River Rd. ca. 12 mi. N.E. of Grayling. Grayling Twp. T27N, R2W, Sec. 26 NE1/41
- NW of 7th Street and along Lake Margreth NW Camp Grayling cantonment area. T26N R04W, SEc. 21 SW1/4SE1/41
- Near E. Branch [of Au Sable River] Grayling,1
- Near E. bank of South Brach, Au Sable River, ca. 7 mi. NE of Roscommon.1
- Near Flatrock.1
- Near North Branch of Ausable River1
- Near Titusville1
- Near W. side of Howe's Lake, ca. 5.5 mi. NW of Grayling.1
- Near Walnut.1
- No data1
- North shore of Little K P Lake. T28N R02W, Sec. 33 SW1/4NE1/41
- Northwest side of K P Lake. T28N R02W, Sec. 33 SW1/4NE1/41
- Onondaga Springs, ca. 5 mi SE of Leasburg along County Road H1
- Pickerel Slough, Prairie du Chien.1
- Pymatuning Swamp near Hartstown where Rte 285 crosses Swanp1
- Pymatuning Swamp near Hartstown where Rte. 2851
- Pymatuning Swamp, Blackjack Swamp section. 165 degrees & 1.84 miles from junction of US Rt 6 & state line, Conneaut Twp.1
- Pymatuning Swamp, PA Gameland 214, along drainage channel cutting into west embankment of swamp 193 degree & 1.35 miles from junction of PA 285 & Bessemer & Lake Erie RR tracks, West Fallowfield Twp.1
- River Lake, near inlet of East Branch Au Sable River, 0.05 mi. W. of Kinney Rd and 0.7 mi. N. of County Road 6121
- Roadside in State Forest campground, NW Lake Margrethe (5 miles west of Grayling). T26N R04W, Sec. 8 SW1/4 SE1/41