The US Department of the Interior (DOI) is responsible for the conservation and management of many of our natural resources. Management agencies that operate under the DOI include, among others, the National Park Service, U.S. Fish and Wildlife Service, Bureau of Land Management, and the Bureau of Indian Affairs.
Click the link to visit the DOI home page: http://www.doi.gov
Source: U.S. Department of the Interior. U.S. Department of the Interior" home page. Accessed on 9 September 2013. Available at http://www.doi.gov