The Seal of the President of the United States is used to mark correspondence from the U.S. President to the U.S. Congress, and is also used as a symbol of the presidency itself. To learn about the origin of the seal, see the following article from Smithsonian.com.
This guide serves as a starting point for presidential research. Click on the tabs above to access the various resources and to search for books and articles on your topic. Please contact me if you need help locating materials for your project. You might want to also consult the following guides: