Subject
Trails
Outdoor recreation
69
Roads
43
Hiking
31
Shenandoah National Park (Va.)
24
Cuyahoga Valley National Park (Ohio)
18
Motor vehicles Recreational use
16
Forest roads
15
Blue Ridge Parkway (N.C. and Va.)
14
Pacific Crest Trail
13
Express highways
12
Recreation areas
9
Camp sites, facilities, etc
8
Chequamegon National Forest (Wis.)
8
Public lands Recreational use
7
Wilderness areas
7
Historic sites
6
Horsemanship
6
Humboldt National Forest (Nev.)
5
Klamath National Forest (Calif. and Or.)
5
Mountain biking
5
National parks and reserves
5
Off-road vehicle trails
5
Rocky Mountain Arsenal National Wildlife Refuge (Colo.)
5
Toiyabe National Forest (Nev. and Calif.)
5
Wayne National Forest (Ohio)
5
Automobile driving
4
Automobiles Recreational use
4
Land Between the Lakes (Ky. and Tenn.)
4
Pisgah National Forest (N.C.)
4
Wildlife watching
4
Black Hills National Forest (S.D. and Wyo.)
3
Chesapeake and Ohio Canal (Md. and Washington, D.C.)
3
Cross-country skiing
3
Dixie National Forest (Utah)
3
Gifford Pinchot National Forest (Wash.)
3
Grand Canyon National Park (Ariz.)
3
North Country National Scenic Trail
3
Public lands
3
Snowmobiling
3
All terrain vehicle trails
2
All terrain vehicles
2
Alpine Loop National Back Country Byway (Colo.)
2
Backpacking
2
Bird watching
2
Buckeye Trail (Ohio)
2
California National Historic Trail
2
Camping
2
Cape Perpetua Scenic Area (Or.)
2
Cibola National Forest (N.M.)
2
more ...