1. Boundary Waters Canoe Area Wilderness: 1991 visitor survey data
- Author(s):
- Watson, Alan E.; Cole, David N.; Cronn, Richard; Sullivan, Z. Kent
2. 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.