Subject
Hiking
Outdoor recreation
8
Trails
6
Public lands Recreational use
5
Camp sites, facilities, etc
4
Grand Canyon National Park (Ariz.)
3
Datil Well Campground (N.M.)
2
Catron County (N.M.)
1
Dripping Springs Natural Area (N.M.)
1
Historic sites
1
Huron National Forest (Mich.)
1
Inyo National Forest (Calif. and Nev.)
1
Manistee National Forest (Mich.)
1
National monuments
1
Natural areas
1
Nature observation
1