- United States, Virginia, Wise County2
- United States, Virginia, Wise County, Big Stone Gap2
- United States, Washington, Pierce County, Fort Lewis2
- United States, West Virginia, Cabell County, Huntington2
- United States, West Virginia, Fayette County, Thurmond2
- United States, West Virginia, Harrison County, Bridgeport2
- United States, West Virginia, Jackson County, Ravenswood2
- United States, West Virginia, Kanawha County, Cabin Creek2
- United States, West Virginia, Marion County, Grant Town2
- United States, West Virginia, Monongalia County, Everettville2
- United States, West Virginia, Monongalia County, Maidsville2
- United States, West Virginia, Preston County, Kingwood2
- United States, West Virginia, Raleigh County, Affinity2
- United States, West Virginia, Randolph County, Elkins2
- United States, West Virginia, Wyoming County, Clear Fork2
- United States, West Virginia, Wyoming County, Kopperston2
- United States, Wyoming2
- United States, Wyoming, Campbell County, Gillette2
- China1
- Germany1
