Subject
National parks and reserves
Cuyahoga Valley National Park (Ohio)
24
Ohio and Erie Canal National Heritage Corridor (Ohio)
15
Treasure hunting
14
Virginia Kendall Reserve (Ohio)
7
Peninsula (Ohio)
4
Boston Village (Summit County, Ohio)
2
Canals History
2
Historic sites
2
Perry's Victory and International Peace Memorial (Put-in-Bay, Ohio)
2
Winter sports
2
Aeronautical museums
1
Children Study and teaching (Elementary)
1
Dayton Aviation Heritage National Historical Park (Ohio)
1
Geology
1
Homes and haunts
1
Hopewell Culture National Historical Park (Ohio)
1
Hopewell Culture National Historical Park (Ohio) Management
1
James A. Garfield National Historic Site (Mentor, Ohio)
1
Outdoor recreation
1
Prehistoric peoples
1
Towpaths
1
William Howard Taft National Historic Site (Cincinnati, Ohio)
1