| 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 |
| Digital Texts and Reports Databases | Libraries |
Quick Take on Library of Congress Subject Headings
Quick Take on Open Access Publishing
Quick Take on Library Technology
Quick Take on the National Trails System
Quick Take on Linked Data and Libraries
Updated October 2021