1. Campsite condition data for the Superstition Wilderness
- Author(s):
- Cole, David N.
2. Campsite condition data for the San Rafael Wilderness
- Author(s):
- Cole, David N.; Spildie, David R.
3. National river recreation study data: a nationwide survey of river recreation use from 1977-1984
- Author(s):
- Cole, David N.