1. A Conceptual Framework for Evaluating and Quantifying Naturalness
2. Problems with using overlay mapping for planning and their implications for geographic information systems
3. Redecorating Nature: Deep Science, Holism, Feeling, and Heart
4. Box, T. W. 1994. Sustainable ecological systems and cultural change. Pages 2–9 in Sustainable ecological systems: implementing an ecological approach to land management. USDA Forest Service, General Technical Report, RM-247, rocky Mountain forest and range Experiment Station, Fort Collins, CO
5. Bryce, S. A., J. M. Omernik, D. E. Pater, M. Ulmer, J. Schaar, J. Freeouf, R. Johnson, P. Kuck, S. H. Azevedo. 1998. Ecoregions of North Dakota and South Dakota. Two-sided color poster with map, descriptive text, summary tables, and photographs). U.S. Geological Survey, Reston, Virginia. Scale 1:1,500,000.