1. Boundary Waters Canoe Area Wilderness: 1991 visitor survey data
- Author(s):
- Watson, Alan E.; Cole, David N.; Cronn, Richard; Sullivan, Z. Kent
2. Data from monitoring inter-group encounters at the Alpine Lakes Wilderness in 1991
- Author(s):
- Watson, Alan E.; Cronn, Rich; Christensen, Neal A.
3. Three Sisters, Mt. Jefferson, and Mt. Washington wilderness areas in Oregon: 1991 visitor survey data
- Author(s):
- Cole, David N.; Watson, Alan E.; Cronn, Richard C.