1. Alabama Department of Environmental Management. 1995. Alabama/Mississippi pilot reference site project: 1990?1994. Alabama Department of Environmental Management, Montgomery, Alabama, 37 pp.
2. Andres, H. J., and R. W. Cowlin. 1936. Forest type map of Oregon: Northeast quadrant. Pacific Northwest Forest Experiment Station, US Forest Service, Portland, Oregon. Scale 1:253,440.
3. Bailey, R. G. 1983. Delineation of ecosystem regions.Environmental Management 7:365?373.
4. Bailey, R. G. 1984. Testing an ecosystem regionalization.Journal of Environmental Management 19:239?248.
5. Bailey, R. G., P. E. Avers, T. King, and W. H. McNab (eds.). 1994. Ecoregions and subregions of the United States. Map 1:7,500,000 scale and supplemental table of map unit descriptions. US Forest Service, Washington, DC.