The Lyndon Baines Johnson Presidential Library and Museum

Situated on a 30-acre site on The University of Texas campus in Austin, Texas, the Library houses 45 million pages of historical documents, 650,000 photos and 5,000 hours of recordings from President Johnson's political career, including about 643 hours of his recorded telephone conversations.
The museum collection of the Lyndon Baines Johnson Library and Museum contains more than fifty-four thousand objects donated by the President and Mrs. Johnson, their family, close friends, associates, and the American people.
The Lyndon Baines Johnson Library and Museum is one of 13 Presidential Libraries administered by the National Archives and Records Administration.
http://www.lbjlibrary.org/