Correspondence, manuscripts, documents, memorabilia, and scrapbooks. Correspondence ranges from personal, family, literary, and fan mail to that dealing with political issues and public housing. Correspondents include Whittaker Chambers, Clarence Darrow, Ruby Darrow, John Dos Passos, Max Eastman, Joseph Freeman, Michael Gold, Upton Sinclair, and Robert F. Wagner. There are manuscript versions for many of Harrison's novels and stories, some of which are unpublished. The memorabilia include tapes and recordings of Harrison's interviews and readings of his works. Scrapbooks consist primarily of newspaper clippings relating to his books, public housing, labor relations, and socialism. Also, copies of some of his books in various editions and translations.