Hatfield Library also contains the Mark O. Hatfield Archives containing the papers, memorabilia, and books of the former United States Senator and Willamette alumni. The papers include those from his time in the Oregon legislature through his time in the Senate and after leaving the Senate. Hatfield's personal library is part of the regular library catalog, however the books are non-circulating. The rest of the collection is not open to the public, as Hatfield's archives will not become accessible until 20 years after his death. The library also contains the university's archives on the second floor. The climate-controlled archives are housed in a area that includes offices for staff, including the school's official archivist.