U.S. Department of Agriculture1. National Marine Debris Monitoring Program: citizen science observations from 1997–2007
- Author(s):
- Ribic, Christine A.; Sheavly, Seba B.; Rugg, David J.
2. Desolation Wilderness: data from 1997-1998 visitor response to fees, fee demonstration project
- Author(s):
- Watson, Alan E.; Puttkammer, Annette; Christensen, Neal A.
3. Auyuittuq and Quttinirpaaq National Parks in the eastern Arctic Nunavut Region of Canada: 2003-2004 visitor experience study
- Author(s):
- Watson, Alan E.; Lachapelle, Paul R.; McCool, Stephen F.
4. Gates of the Arctic Kobuk River: 2001 sport hunter survey data
- Author(s):
- Christensen, Neal A.; Watson, Alan E.