Collection 1. Upton Sinclair Miscellaneous Materials V: Letters by Sinclair in Periodicals, 1913-1962
Collection 1. Upton Sinclair Miscellaneous Materials VIII: Advertisements, Theater Programs, and Playbills about Sinclair's Books, Plays, and Appearances, 1906-1960
Collection 1. Upton Sinclair Miscellaneous Materials VII: Articles about Sinclair and His Works, 1906-1965