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While the National Archives holds records produced during all Presidential administrations (for example, the records of the State Department and other departments), it does not hold the papers produced by Presidents before Hoover.
Look to the Presidential Libraries for papers of President Hoover and those after him; papers of earlier Presidents are held at various institutions, listed here: Other Places to Research Presidential Materials
One resource for digitized copies of Abraham Lincoln's records is the Papers of Abraham Lincoln Project.
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Why all past presidents' records aren't part of NARA's holdings is a great question for which archival records provide some interesting insights! Until the passage of the Presidential Records Act (PRA) in 1978, presidential papers by custom were considered personal property. The U.S. National Study Commission On Records And Documents of Federal Officials (1974-1977) examined a number of government records issues, among them whether the practice of private ownership of presidential records should continue. If you're interested in archival records about the change from private to statutorily mandated public ownership, check out the good summary and finding aid information at the NARA administered Gerald R. Ford Presidential Library and Museum. You'll also find good results on the work of the 1974-1977 Commission by searching The National Archives Catalog. A chapter written by Trudy Huskamp Peterson for a NARA publication and included among Archives History Sources places the work of the Commission and the passage of the PRA in historical context: https://www.archives.gov/about/history/sources/peterson.pdf.