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One often overlooked method for finding books on a topic is BROWSING the shelves. Print books on the presidents are located on the Sixth Floor in the call number range E813 through E909. Locate the specific call number area for your assigned presidential administration in the Library of Congress Classification Outline.
The Public Papers of the Presidents of the United States are available on the Fifth Floor in the J80 call number area. Online Papers are available here. This government publication commenced in 1957 and contains the Presidents' public writings, addresses, remarks, and speeches that were issued by the Office of the Press Secretary.
If you prefer e-books, type in your keywords into OneSearch and then click on the magnifying glass. Once your results list populates, you can use the filters on the left-hand side to see only full text, eBooks: