USGS Fact Sheet 2005-3005 Biological Research on Fire in the West
Wildland fires are a natural feature of many ecosystems, including grasslands, forests, and shrublands. However, years of fire exclusion have led to accumulations of dead fuels and increases in the density of fire-intolerant species.
The link address is: http://fresc.usgs.gov/products/fs/fs-2005-3005.pdf
