Included are books that focus on general and specialized information about endangered and threatened species. Given the length of time it takes to publish books and the fact that information is constantly evolving, it is important to supplement books with journal articles and other sources as a way to keep up-to-date.

The subscription resources marked with a padlock are available to researchers on-site at the Library of Congress. If you are unable to visit the Library, you may be able to access these resources through your local public or academic library.