- At Curry1
- At South Fork River and Alum Creek1
- Bastrop1
- Benoit's River, Humber Arm, Humber1
- Berkshire1
- Big Chimney, slope of Mt. Collins, Fernald Basin1
- Big Run Trail, Shenandoah National Park1
- Brookhaven National Laboratory1
- Butler Creek near Iron City1
- Ca. 15 km NW of Bancroft; Baptiste Lake, Herschel Township1
- Ca. 2 km NW of Orrville; Christie Twp1
- Cabin John1
- California1
- Canaan1
- Cape Breton Highlands National Park, Paquette Lake1
- Cass1
- Central Yukon River District, Livengood Quadrangle; Cleary Summit, Steese Highway, 20 miles NE College1
- Clark1
- Clay1
- Cleared area at radio station, Yakutat1