Guides to the Internet
| Animals and Wildlife | Legal Sources |
| Archeology | Native Americans |
| Climate Change | Plants includes forestry and range management |
| Government | Science |
| Historic Preservation | Water Supply includes water resources development and water law |
| Insular Areas of the United States and Freely Associated States | Wetlands and Stream Conservation includes ecological restoration |
| General Reference Sources | U.S. Department of the Interior Publications |
| Journal Articles and Reports | Libraries |