U.S. Forest Service
The United States Forest Service is an agency of the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands, which encompass . Major divisions of the agency include the National Forest System, State and Private Forestry, Business Operations, and the Research and Development branch. Managing approximately 25% of federal lands, it is the only major national land agency that is outside the U.S. Department of Interior. Wikipedia*
On the C-SPAN Networks:
The U.S. Forest Service has 2 videos in the C-SPAN Video Library; the first program was in a 1980, [The Eruption of Mount St. Helens].