1. Baldwin, M. F., and D. H. Stoddard, Jr., 1973, The off-road vehicle and environmental quality: The Conservation Foundation, Washington, D.C., 61 p.
2. Behrens, E. W., R. L. Walton, P. D. Carangelo, W. H. Sohl, and H. S. Finkelstein, 1975, Effect of vehicular and pedestrian traffic on backshore vegetation and dune development: Beach impact study, Padre Island National Seashore: Final Report for Office of Natural Science, Southwest Region, National Park Service, 50 p.
3. Carter, J., 1977, Executive order 11989: Off-road vehicles on public lands; Federal Register, 42 (101), 2 p.
4. Griggs, G. B., and B. L. Walsh, 1981, The impact, control, and mitigation of off-road vehicle activity in Hungry Valley, California: Environ. Geol., v. 3, p. 229–243.
5. Report No. 34;S. P. Leatherman,1979