| Animals and Wildlife | Legal Sources |
| Archeology | The National Trails System |
| Climate Change | Native Americans |
| Government | Plants includes forestry and range management |
| Historic Preservation | Science |
| Insular Areas of the United States and Freely Associated States | Water Supply includes water resources development and water law |
| General Reference Sources | Wetlands and Stream Conservation includes ecological restoration |
| Digital Texts and Reports Databases | U.S. Department of the Interior Publications |
Quick Take on Library of Congress Subject Headings
Quick Take on Open Access Publishing
Quick Take on Library Technology
Quick Take on Linked Data and Libraries
Updated February 2023