1. Boundary Waters Canoe Area Wilderness: 1991 visitor survey data
- Author(s):
- Watson, Alan E.; Cole, David N.; Cronn, Richard; Sullivan, Z. Kent
2. Shining Rock Wilderness: 1990 visitor survey data
- Author(s):
- Watson, Alan E.; Cole, David N.; Roggenbuck, Joseph W.; Stubbs, Christopher J.