1. Arft, A. M. 1995. The genetics, demography, and conservation management of the rare orchid Spiranthes diluvialis. Ph.D. dissertation, University of Colorado, Boulder
2. Baron J. S., H. M. Rueth, A. M. Wolfe, K. R. Nydick, E. J. Allstott, J. T. Minear, B. Moraska. 2000. Ecosystem responses to nitrogen deposition in the Colorado Front Range. Ecosystems 3:352–368
3. Bestegen, K., and B. Kondratieff. 1996. Fishes, macroinvertebrates, and habitat of South Boulder Creek, Colorado, within City of Boulder Open Space property. Final report, City of Boulder
4. Blaikie P. M., H. C. Brookfield 1987. Land degradation and society. Methuen, London.
5. Braun B. 2002. The intemperate rainforest: nature, culture, and power on Canada’s west coast. University of Minnesota Press, Minneapolis, MN.