The Herbert Hoover Presidential Library contains the personal papers of Herbert Hoover, 31st President of the United States, and his wife, Lou Henry Hoover.  The Library holds copies of selected records from the National Archives that document the activities of federal agencies closely associated with Hoover, and important national conferences he convened.  The Library also holds 300 additional collections of personal papers from individuals who either worked with Herbert Hoover, or were associated with him through shared areas of interest or activity.  In addition to Hoover's life and Presidency, topics covered include atomic energy, aviation, international relief work, journalism, agriculture economics, non-interventionism prior to World War II, conservative political thought in the mid-20th century, and Laura Ingalls Wilder.