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Author/Creator
- Adam Matthews Digital (Firm), digitiser5,256
- Adam Matthew Digital (Firm), digitiser4,563
- National Archives (Great Britain), owner885
- Riewert Tode Collection of German Student Movements and Counter-Culture601
- United States. Congress. House. Committee on Un-American Activities489
- United States410
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)393
- Foreign Office, author310
- ebrary, Inc306
- Project Muse289
- Lenin, Vladimir Ilʹich, 1870-1924248
- United States. Congress. Senate. Committee on the Judiciary. Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws222
- United States. Congress. House. Committee on Un-American Activities. (1945-1969)201
- Marx, Karl, 1818-1883170
- Trotsky, Leon, 1879-1940165
- Mao, Zedong, 1893-1976160
- Owen, Robert, 1771-1858124
- United States. Congress. House119
- United States. Congress. Senate. Committee on the Judiciary116
- Engels, Friedrich, 1820-1895109