Nearly one hundred and fifty audiotapes of lectures delivered at the Institute for Humane Studies have been digitized for preservation and access by Hoover’s audio lab. The institute is a US nonprofit organization that promotes laissez-faire economics. The tapes include lectures on economics and political theory by Milton Friedman, Friedrich von Hayek, John Jewkes, Arthur Kemp, Felix Morley, Bruno Leoni, Jacques Rueff, and others.

More than two dozen audiotapes in the Heinrich Himmler papers have been digitized by Hoover’s audio lab for both preservation and access. Many are Himmler’s speeches to police and military leaders, including Volksgrenadier officers, SS Panzerkorps commanders, Waffen SS commanders, and Ordnungspolizei leaders. Two tapes with voices in English may be from a bugged meeting of British and American POWs in a German camp. Some recordings are fragmentary; although most were recorded in 1943 and 1944, one tape is from 1940.

More than two hundred fifty audiotapes in the Milton Friedman papers are available for listening after having been digitized by Hoover's audio lab. The earliest, recorded in 1961, captures a debate between Friedman and Senator Joseph Clark on the proper role of the federal government in which Friedman frames his argument around a critique of John F. Kennedy's inaugural address.