Region
Alabama
1
Alaska
2
Anderson County
1
Antietam National Battlefield
1
Antietam National Battlefield (Md.)
1
Appalachian Basin
1
Austin County
1
Beaverhead County
1
Belmont County
2
California
4
Carter County
1
Chesapeake and Ohio Canal National Historical Park
2
Cleveland
2
Colorado
1
Creek County
1
Cuyahoga County
1
Dayton Region
1
Estill County
1
Greene County
1
Harpers Ferry National Historical Park
1
Hopewell Culture National Historical Park
1
Hopewell Culture National Historical Park (Ohio)
1
Idaho
2
Illinois
1
Indiana
2
Kansas
1
Kentucky
4
Klamath Mountains (Calif. and Or.)
1
Lake City Quadrangle
1
Louisiana
1
Maryland
1
Miami County
1
Miami River Valley
1
Montana
2
Montgomery County
1
Nebraska
1
Nevada
1
North America
1
Ohio
37
Ohio River Valley
2
Oklahoma
2
Oregon
1
Pennsylvania
5
Portage County
2
Potomac River Valley
1
Santa Barbara County
1
South Dakota
1
Stephens County
1
Teton County
1
Texas
2
more ...