Department of the Interior - Sub-Departments
The Department of the Interior is in charge of managing the U.S. wildlife. They protect lands and waterways and help to sustain natural energry resources. In addition, they stand up for America's tribal nations and island communities. 
This page contains a list of sub-departments that are a part of the Department of the Interior. This is an active list that is open to change, and it is meant to be a convenient public reference, not an official list. All the sub-departments listed below are referenced from this department's government website , where an official list may be accessed.
Bureau of Indian Affairs
Bureau of Land Management
Bureau of Reclamation
Minerals Management Service
National Park Service
Office of Surface Mining, Reclamation and Enforcement
U.S. Fish and Wildlife Service
U.S. Geological Survey
- 'Interior Organizational Chart.' U.S. Department of the Interior. 06-07-2010. <http://www.doi.gov/whoweare/orgchart.cfm#>.