The JC Williamson Ltd archives include a wide range of materials, such as business records, playscripts, libretti, music, programs, magazines, books, costume designs, and photographs. It also contains personal papers from Williamson's business partners, the Tait family and George Tallis.

About 140 oral history interviews, the majority for his Maltese-Australian and Polish-Australian folklore and social history projects. Personal papers of York plus papers of the historian Michael Cigler. Also a large quantity of Maltese newspapers, student newspapers, radical pamphlets and ephemera.

Over 530 pamphlets collected by Meyer (Max) Zwalf on socialism and related subjects published in Europe from 1875 to 1950.