USGS Fact Sheet 2005-3091 (July 2005) USGS Providing Scientific Understanding of the Sagebrush Biome
Early explorers wrote about the vast sea of sagebrush that stretched in front of them. Today, the consequences of land-use practices, invasion by exotic plants, and altered disturbance regimes have touched virtually all of these seemingly endless expanses.
The link address is: http://fresc.usgs.gov/products/fs/fs2005-391.pdf