Presidential Libraries are maintained by the National Archives beginning with President Hoover. Information on researching presidential documents in these libraries is available here. The Congressional Research Service recently produced a report on the Presidential Libraries Act and the Establishment of Presidential Libraries.
If you have any further questions about finding or using any of the materials described in this guide, come to the Reference Desk. A reference librarian will be able to assist you with identifying and locating the materials you need for your research projects.