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Government Websites

Department of the Interior 
The United States Department of the Interior (DOI) is the federal executive department of the United States government responsible for managing and conserving most federal lands and natural resources and administering programs relating to Native Americans, Alaska Natives, Native Hawaiians, territorial affairs, and insular areas.

Department of Interior Websites

Bureau of Indian Affairs
The Bureau of Indian Affairs (BIA), also known as Indian Affairs (IA), is a United States federal agency responsible for implementing federal laws and policies related to Native Americans and Alaska Natives and administering and managing over 55,700,000 acres of reservations held in trust by the U.S. federal government for indigenous tribes. It services roughly 2 million indigenous Americans across 574 federally recognized tribes.
Bureau of Land Management
The Bureau of Land Management (BLM) is a federal agency that administers federal lands in the United States. The BLM oversees more than 247.3 million acres of land or one-eighth of the United States's total landmass. It also manages the federal government's nearly 700 million acres of subsurface mineral estate located beneath federal, state, and private lands severed from their surface rights by the Homestead Act of 1862.
Bureau of Safety and Environmental Enforcement
The Bureau of Safety and Environmental Enforcement (BSEE) oversees improving safety and ensuring environmental protection relating to the offshore energy industry on the United States Outer Continental Shelf. Its functions include the authority to inspect, investigate, summon witnesses and produce evidence, levy penalties, cancel or suspend activities, and oversee safety, response, and removal preparedness.

National Indian Gaming Commission
The National Indian Gaming Commission (NIGC) is a federal agency that regulates gambling. However, the U.S. Department of Justice and the Department of the Interior also have responsibilities related to gaming and Indian gaming, respectively. The commission works closely with the Departments of Justice and the Department of the Interior on game classification and Indian lands questions. 
National Park Service
The National Park Service (NPS) is an agency of the United States federal government that manages all national parks, most national monuments, and other natural, historical, and recreational properties, with various title designations. The NPS preserves the ecological and historical integrity of the places entrusted to its management and makes them available for public use and enjoyment.
United States Fish and Wildlife Service
The United States Fish and Wildlife Service (FWS) oversees the management of fish, wildlife, and natural habitats in the United States. The FWS's responsibilities include enforcing federal wildlife laws, protecting endangered species, managing migratory birds, restoring nationally significant fisheries, conserving and restoring wildlife habitats, and distributing money to fish and wildlife agencies of U.S. states.
The United States Geological Survey
The United States Geological Survey (USGS) is an agency whose work spans the disciplines of biology, geography, geology, and hydrology. The USGS studies the landscape of the United States, its natural resources, and the natural hazards that threaten it. It also makes maps of extraterrestrial planets and moons based on data from U.S. space probes. The USGS is a fact-finding research organization with no regulatory responsibility.